CN113685260B

CN113685260B - Cooling system fault diagnosis method and device and working machine

Info

Publication number: CN113685260B
Application number: CN202111044186.7A
Authority: CN
Inventors: 周林学; 吴小忠; 高永红
Original assignee: Shanghai Huaxing Digital Technology Co Ltd
Current assignee: Shanghai Huaxing Digital Technology Co Ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2022-10-11
Anticipated expiration: 2041-09-07
Also published as: CN113685260A

Abstract

The invention provides a cooling system fault diagnosis method, a device and a working machine, wherein the method comprises the following steps: acquiring target operation data corresponding to the cooling system; acquiring diagnostic data corresponding to the target operation data based on a fault diagnosis model; determining whether the cooling system is malfunctioning based on the target operational data and the diagnostic data; wherein the fault diagnosis model is pre-acquired based on sample operating data of the cooling system. According to the cooling system fault diagnosis method, the cooling system fault diagnosis device and the working machine, whether the cooling system has a fault or not is judged according to the target operation data corresponding to the cooling system and the diagnosis data obtained based on the fault diagnosis model, the fault diagnosis of the cooling system can be realized more efficiently and more simply, and the fault diagnosis accuracy of the cooling system can be improved.

Description

Cooling system fault diagnosis method and device and working machine

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a cooling system fault diagnosis method and device and operating machinery.

Background

During the operation of the diesel engine, the overheating fault of the diesel engine can be avoided because local overhigh temperature of each part in the diesel engine is avoided. The cooling system can cool the interior of the diesel engine, and prevent the diesel engine from overheating faults.

In the prior art, operation and maintenance personnel can diagnose faults of the cooling system through dismounting, visual inspection, overhauling and other modes. However, the efficiency of performing manual fault diagnosis on the cooling system is low, and how to perform more efficient fault diagnosis on the cooling system is an urgent issue to be solved in the field.

Disclosure of Invention

The invention provides a cooling system fault diagnosis method and device and an operating machine, which are used for solving the defect of low efficiency of fault diagnosis of a cooling system in the prior art and realizing more efficient fault diagnosis of the cooling system.

The invention provides a fault diagnosis method for a cooling system, which comprises the following steps:

acquiring target operation data corresponding to the cooling system;

acquiring diagnostic data corresponding to the target operation data based on a fault diagnosis model;

determining whether the cooling system is malfunctioning based on the target operational data and the diagnostic data;

wherein the fault diagnosis model is pre-acquired based on sample operating data of the cooling system.

According to the fault diagnosis method for the cooling system, the target operation data comprises at least one group of the following data:

a first temperature of cooling fluid at an inlet of a pumping device and a second temperature of cooling fluid at an outlet of a thermostat in the cooling system;

the rotation speed of the engine and the first pressure of the cooling liquid at the inlet of the pumping device;

wherein the cooling system is used for cooling the engine.

According to the fault diagnosis method for the cooling system provided by the invention, when the target operation data includes the first temperature and the second temperature, the fault diagnosis model-based diagnostic data corresponding to the target operation data is obtained, and the fault diagnosis method specifically includes:

and inputting the first temperature into the fault diagnosis model, and acquiring a third temperature of the cooling liquid at a liquid outlet of the thermostat as the diagnosis data corresponding to the target operation data.

Correspondingly, the determining whether the cooling system fails based on the target operating data and the diagnostic data specifically includes:

determining a temperature threshold according to the third temperature;

determining that the cooling system is malfunctioning if a duration of the second temperature being less than the temperature threshold exceeds a first duration threshold.

According to the fault diagnosis method for the cooling system provided by the invention, under the condition that the target operation data comprises the rotating speed of the engine and the first pressure, the fault diagnosis model is used for acquiring diagnosis data corresponding to the target operation data, and the fault diagnosis method specifically comprises the following steps:

and inputting the rotating speed into the fault diagnosis model, and acquiring a second pressure of the cooling liquid at the liquid inlet of the pumping device as the diagnosis data corresponding to the target operation data.

Correspondingly, the determining whether the cooling system is in fault based on the target operation data and the diagnosis data specifically includes:

determining a first pressure threshold based on the second pressure;

determining that the cooling system is malfunctioning if a length of time that the first pressure is less than the first pressure threshold exceeds a second length of time threshold.

According to the fault diagnosis method for the cooling system provided by the invention, when the time length of the first pressure smaller than the first pressure threshold exceeds the second time length threshold, the fault of the cooling system is determined, and the fault diagnosis method specifically comprises the following steps:

determining that an impeller of a pumping device in the cooling system is malfunctioning if a length of time that the first pressure is less than a first pressure threshold exceeds a second length of time threshold.

According to the fault diagnosis method for the cooling system provided by the invention, when the target operation data includes the rotating speed of the engine and the first pressure, the fault diagnosis model is used for acquiring diagnosis data corresponding to the target operation data, and the fault diagnosis method specifically comprises the following steps:

inputting the rotating speed into the fault diagnosis model, and acquiring a third pressure of the cooling liquid at an inlet of the pumping device as the diagnosis data corresponding to the target operation data;

determining a second pressure threshold based on the third pressure;

determining that the cooling system is malfunctioning if a length of time that the first pressure is greater than the second pressure threshold exceeds a third length of time threshold.

According to the fault diagnosis method for the cooling system provided by the invention, when the time length that the first pressure is greater than the second pressure threshold exceeds the third time length threshold, it is determined that the cooling system is in fault, and the fault diagnosis method specifically comprises the following steps:

and under the condition that the time length that the first pressure is greater than the second pressure threshold value exceeds a third time length threshold value, determining that a liquid outlet of a pumping device in the cooling system is blocked.

The present invention also provides a cooling system fault diagnosis apparatus, including:

the data acquisition module is used for acquiring target operation data corresponding to the cooling system;

the data operation module is used for acquiring diagnostic data corresponding to the target operation data based on a fault diagnosis model;

a fault diagnosis module for judging whether the cooling system is in fault based on the target operation data and the diagnosis data;

The present invention also provides a cooling system fault diagnosis system, including: the cooling system failure diagnosis device and the temperature pressure sensor as described above;

and the temperature and pressure sensor is used for acquiring the temperature and/or pressure of cooling liquid at an inlet of the pumping device in the cooling system.

The present invention also provides a work machine comprising: such as the cooling system fault diagnostic system described above.

The present invention also provides an electronic device, comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor executes the program to implement the steps of the cooling system fault diagnosis method according to any one of the above.

The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the cooling system fault diagnosis method as described in any one of the above.

The present invention also provides a computer program product comprising a computer program which, when being executed by a processor, carries out the steps of the method for diagnosing faults in a cooling system as described in any one of the above.

According to the cooling system fault diagnosis method, the cooling system fault diagnosis device and the working machine, whether the cooling system has a fault or not is judged according to the target operation data corresponding to the cooling system and the diagnosis data obtained based on the fault diagnosis model, the fault diagnosis of the cooling system can be realized more efficiently and more simply, and the fault diagnosis accuracy of the cooling system can be improved.

Drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a cooling system in a fault diagnosis method for the cooling system provided by the invention;

FIG. 2 is a schematic flow diagram of a cooling system fault diagnosis method provided by the present invention;

FIG. 3 is a schematic diagram of the location of a temperature and pressure sensor in the cooling system fault diagnosis method provided by the present invention;

FIG. 4 is a fitted function curve of the real-time temperature of the cooling fluid at the inlet of the pumping device and the theoretical temperature of the cooling fluid at the outlet of the thermostat in the cooling system failure diagnosis method provided by the present invention, in the case where the cooling system is not in failure;

FIG. 5 is a curve of a fitted function of the real-time rotational speed of the engine and the theoretical pressure of the coolant at the inlet of the pumping device in the case of damage to the impeller of the pumping device in the cooling system fault diagnosis method provided by the present invention;

FIG. 6 is a fitting function curve of the real-time rotational speed of the engine and the theoretical pressure of the cooling fluid at the inlet of the pumping device in the case of a blocked outlet of the pumping device in the cooling system according to the method for diagnosing a fault in a cooling system of the present invention;

FIG. 7 is a schematic structural diagram of a fault diagnosis device for a cooling system provided by the present invention;

FIG. 8 is a schematic structural diagram of a temperature and pressure sensor in a fault diagnosis system of a cooling system provided by the present invention;

fig. 9 is a schematic structural diagram of an electronic device provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the cooling system may be composed of a pumping device (a water pump or a hydraulic oil pump), a radiator, a cooling fan, a thermostat, and other accessories. The pumping device may pressurize the cooling fluid to circulate it through the cooling system. The radiator is a heat exchanger and can be used for cooling the cooling liquid. When the cooling fan rotates, air can be sucked in to pass through the radiator, so that the heat dissipation capacity of the radiator is enhanced, and cooling of cooling liquid is accelerated. The thermostat is a valve for controlling the flow path of the cooling fluid, and can open or close the passage of the cooling fluid to the radiator according to the temperature of the cooling fluid. The cooling system can be used for heat dissipation of equipment such as a gasoline engine, a diesel engine, a natural gas engine and the like. The fault diagnosis method of the cooling system provided by the invention can be used for diagnosing whether the cooling system consisting of the pumping device, the radiator, the cooling fan, the thermostat and other auxiliary devices has faults or not, and further determining the components with the faults in the cooling system and the reasons of the faults.

The cooling system for radiating heat from a diesel engine will be described below as an example. Fig. 1 is a schematic structural diagram of a cooling system in a fault diagnosis method for the cooling system provided by the invention. As shown in fig. 1, the pumping device 101 is disposed outside the body of the diesel engine 108, and can take power from the diesel engine through a belt or a gear. The pumping device inlet 102 is connected to the radiator 103 through a radiator outlet 112, and the pumping device 101 sucks low-temperature coolant from the radiator 103 through the pumping device inlet 102, and starts a cooling cycle via the pumping device outlet 109 and the diesel engine water channel inlet 110 to cool and dissipate heat of relevant parts of the diesel engine. After the cooling fluid cools and dissipates heat from the relevant diesel engine components, the temperature of the cooling fluid rises and returns to the radiator 103 through the thermostat liquid outlet 105 and the radiator liquid inlet 111 to be cooled again.

The failure of the cooling system, which is usually concentrated on the coolant heat sink 107 and the pumping device 101 composed of the heat sink 103 and the cooling fan 106, may cause the temperature of the coolant to be too high, so that the normal heat dissipation effect cannot be achieved. In general, fault diagnosis of the coolant heat dissipation device 107 is realized based on manual maintenance, and for the pumping device 101, the pumping device 101 is usually connected with a transmission shaft or a gear chamber of the diesel engine 108, and an impeller 301 of the pumping device is hidden in a machine body, when fault diagnosis is performed on the pumping device 101, an operation and maintenance person is required to disassemble the pumping device 101 to diagnose whether the pumping device 101 is faulty or not, and the assembly and disassembly of the pumping device 101 are complex, so that a lot of time and labor are consumed.

Fig. 2 is a schematic flow chart of a fault diagnosis method for a cooling system provided by the invention. The cooling system fault diagnosis method of the present invention is described below with reference to fig. 2. As shown in fig. 2, the method includes: and step 201, acquiring target operation data corresponding to the cooling system.

It should be noted that the cooling system in the embodiment of the present invention is any cooling system composed of the pumping device 101 (a water pump or a hydraulic oil pump), the coolant heat sink 107 (including the radiator 103 and the cooling fan 106), the thermostat 104, and other accessories. The following describes a method for diagnosing a fault in a cooling system according to the present invention, taking the cooling system as an example for dissipating heat from a diesel engine.

The target operation data corresponding to the cooling system may reflect the real-time operation status of the cooling system, or the real-time operation status of the cooling system and the real-time operation status of the diesel engine, for example: the real-time temperature of the cooling liquid at the inlet 102 of the pumping device, the real-time temperature of the cooling liquid at the outlet 105 of the thermostat, the real-time pressure of the cooling liquid at the inlet 102 of the pumping device, the real-time rotating speed of the diesel engine and the like in the cooling system.

It should be noted that based on different target operation data of the cooling system, fault diagnosis can be performed on different components in the cooling system, such as: if the obtained target operation data includes the real-time temperature of the coolant at the liquid inlet 102 of the pumping device and the real-time temperature of the coolant at the liquid outlet 105 of the thermostat, the fault diagnosis of the coolant heat sink 107 in the cooling system may be performed based on the target operation data.

Fig. 3 is a schematic diagram of the position of a temperature and pressure sensor in the fault diagnosis method for the cooling system provided by the invention. As shown in fig. 3, a sensor mounting hole 302 may be provided between the pumping device inlet 102 and an impeller 301 in the pumping device for mounting a temperature pressure sensor 303. The temperature pressure sensor 303 may be used to acquire the real-time temperature and/or real-time pressure of the cooling fluid at the pumping device inlet 102.

It should be noted that the sensor mounting holes 302 can also be used to mount a temperature sensor and/or a pressure sensor, respectively.

It should be noted that the pulley 304 in the pumping device may be used to extract power from the diesel engine via a belt.

The target operation data corresponding to the cooling system may be obtained in various ways, such as: the temperature and pressure sensor 303 acquires the real-time temperature of the coolant at the liquid inlet 102 of the pumping device, and after the ECU of the diesel engine 108 acquires the real-time temperature of the coolant at the liquid outlet 105 of the thermostat, the real-time temperature of the coolant at the liquid inlet 102 of the pumping device sent by the temperature sensor and the real-time temperature of the coolant at the liquid outlet 105 of the thermostat sent by the ECU of the diesel engine 108 can be received as target operation data; alternatively, after the Electronic Control Unit (ECU) of the diesel engine 108 acquires the real-time rotation speed of the diesel engine 108, the real-time rotation speed of the diesel engine 108 transmitted by the ECU of the diesel engine 108 may be received as the target operation data. In the embodiment of the present invention, the acquired target operation data corresponding to the cooling system is not specifically limited.

It should be noted that the real-time temperature of the coolant at the thermostat liquid outlet 105 can be obtained through a complete vehicle instrument of the working machine or an ECU of the diesel engine, so that it is not necessary to additionally provide a temperature sensor to acquire the real-time temperature of the coolant at the thermostat liquid outlet 105.

Step 202, acquiring diagnostic data corresponding to target operation data based on a fault diagnosis model; the fault diagnosis model is obtained in advance based on sample operation data of the cooling system.

Specifically, before fault diagnosis of the cooling system, a fault diagnosis model may be constructed based on sample operating data of the cooling system.

The cooling system may be a cooling system that has not failed, or may be a cooling system that is determined to have a predetermined common failure.

It should be noted that common faults that may occur during the actual operation of the cooling system may include, but are not limited to, a sample fault that may be a breakage of the impeller 301 of the pumping device in the cooling system, a fault of the coolant heat sink 107, and the like.

The sample operating data of the cooling system may reflect the operating state of the cooling system under a particular condition.

Sample operational data for the cooling system may be obtained in a variety of ways.

Alternatively, in the event of a cooling system failure, the coolant at the thermostat outlet 105 is returned to the pumping means inlet 102 after passing through a coolant heat sink 107 comprised of a cooling fan 106 and a heat sink 103. The temperature of the coolant at the inlet 102 of the pumping device is generally lower than the real-time temperature of the coolant at the outlet 105 of the thermostat, and the larger the difference between the two temperatures is, the better the heat dissipation effect of the cooling system is, and the smaller the difference between the two temperatures is, the worse the heat dissipation effect of the cooling system is.

In the event that the cooling system is not malfunctioning, the temperature sensor may acquire the real-time temperature T of the coolant at the inlet 102 of the pumping device _i At T _i After reaching 50 ℃, the ECU of the diesel engine can synchronously acquire the real-time temperature T of the cooling liquid at the liquid outlet 105 of the thermostat _oi And in case of no failure of the cooling system, will T _oi As T _i The theoretical temperature of the coolant at the corresponding thermostat outlet 105, where i is a positive integer greater than 1. T is a unit of _i And T _oi The correspondence of (a) can be as shown in table 1.

TABLE 1T _i And T _oi Comparison table of

Receiving T sent by the temperature sensor _i And T sent by ECU of diesel engine _oi Thereafter, T may be adjusted _i And T _oi The operating state of the cooling system that has not failed is reflected as sample operating data of the sample cooling system.

Based on the collected T _i 、T _oi And T _i And T _oi Can be linearly fitted to obtain the expression T _i And T _oi Fitting curve of corresponding relation.

Fig. 4 is a fitting function curve of the real-time temperature of the cooling liquid at the inlet of the pumping device and the theoretical temperature of the cooling liquid at the outlet of the thermostat under the condition that the cooling system is not in fault in the cooling system fault diagnosis method provided by the invention. As shown in FIG. 4, T _i And T _oi The fitted function curve of (2) is a unitary function broken line.

Based on a fitting function curve of the real-time temperature of the cooling liquid at the liquid inlet of the pumping device and the theoretical temperature of the cooling liquid at the liquid outlet of the thermostat, the corresponding theoretical temperature of the cooling liquid at the liquid outlet of the thermostat can be determined according to the obtained real-time temperature of the cooling liquid at the liquid inlet of the pumping device under the condition that a cooling system is not in fault.

Alternatively, sample operating data for the sample cooling system may be obtained by simulating a fault.

The impeller 301 of the pumping device is damaged, and the pressure of the pumping device 101 sucking the low-temperature coolant from the radiator 103 is reduced, thereby deteriorating the cooling effect. The failure diagnosis of the impeller 301 of the pumping device can be realized only by disassembling the pumping device 101, and the process is complex and has low efficiency.

In the embodiment of the invention, the faulted impeller with missing pages can be arranged in the pumping device 101 to simulate the pumping device 101 with damaged impeller. The device 101 is installed in a cooling system, and the diesel engine is cooled by the cooling system.

In case of damage to the impeller 301 of the pumping device in the cooling system, the ECU of the diesel engine may acquire the real-time rotation speed N of the diesel engine _i The pressure sensor can acquire a certain real-time rotating speed N _i The pressure ViL of the cooling liquid at the liquid inlet 102 of the lower pumping device is used as N under the condition that an impeller 301 of the pumping device in the cooling system is damaged _i The theoretical pressure of the cooling liquid at the inlet of the corresponding pumping device. N is a radical of hydrogen _i The correspondence with ViL can be as shown in table 2.

TABLE 2N _i And V _iL Comparison table of

Receiving N sent by ECU of diesel engine _i After ViL, N may be _i And ViL as sample operation data of the sample cooling system, reflecting the operation state of the cooling system in which the impeller 301 of the pumping device is broken.

Based on the collected N _i ViL, and N _i The correspondence with ViL can be fitted linearly to obtain an indication N when the impeller 301 of the pumping device in the cooling system is damaged _i And ViL.

Fig. 5 is a fitting function curve of the real-time rotation speed of the engine and the theoretical pressure of the cooling liquid at the inlet of the pumping device under the condition that the impeller of the pumping device in the cooling system is damaged in the fault diagnosis method of the cooling system provided by the invention. As shown in fig. 5, when the impeller 301 of the pumping device in the cooling system is broken, N _i And ViL are fitted to a function curve as a polyline of a unitary function.

Based on the fitting function curve, under the condition that an impeller 301 of a pumping device in the cooling system is damaged, the theoretical pressure of the cooling liquid at the liquid inlet of the corresponding pumping device can be determined according to the obtained real-time rotating speed of the diesel engine.

Alternatively, too much impurities in the coolant may cause the pumping device liquid outlet 109 to be blocked, so that the pressure of the pumping device 101 sucking the low-temperature coolant from the radiator 103 is reduced, and the cooling effect is deteriorated. And the fault diagnosis on whether the liquid outlet 109 of the pumping device is blocked can be realized only by disassembling the pumping device 101, so that the process is complex and the efficiency is low. In the embodiment of the invention, a plastic film with a preset size is added in front of a filter screen of a liquid outlet 109 of the pumping device to simulate the pumping device 101 with a blocked liquid outlet. The pumping device 101 with the blocked liquid outlet is installed in a cooling system, and the cooling system is used for cooling the diesel engine.

Under the condition that a liquid outlet of a pumping device in the cooling system is blocked, an ECU of the diesel engine can acquire the real-time rotating speed N of the diesel engine _i The pressure sensor can acquire a certain real-time rotating speed N _i Next, the pressure of the cooling fluid at the inlet 102 of the pumping device is measured, and N is measured _i And ViH as a blockage of the outlet of the pumping device in the cooling system, N _i The theoretical pressure of the cooling liquid at the inlet of the corresponding pumping device. N is a radical of _i The correspondence with ViH may be asShown in table 3.

TABLE 3N _i And V _iH Comparison table of

Receiving N sent by ECU of diesel engine _i After ViH, N may be _i And ViH is used as sample operation data of the sample cooling system and reflects the operation state of the cooling system with the blocked liquid outlet of the pumping device.

Based on the collected N _i ViH, and N _i The correspondence with ViH can be fitted linearly to obtain N when the outlet of the pumping device in the cooling system is blocked _i And ViH.

Fig. 6 is a fitting function curve of the real-time rotation speed of the engine and the theoretical pressure of the cooling fluid at the inlet of the pumping device in the case that the outlet of the pumping device in the cooling system is blocked in the cooling system fault diagnosis method provided by the present invention. As shown in FIG. 6, when the outlet of the pumping device in the cooling system is blocked, N is _i And the fitted function curve of ViH is a univariate function broken line.

Based on the fitting function curve, under the condition that a liquid outlet of a pumping device in the cooling system is blocked, the theoretical pressure of the cooling liquid at the liquid inlet of the corresponding pumping device can be determined based on the obtained real-time rotating speed of the diesel engine.

The fault diagnosis model can be constructed based on a fitting function curve of the real-time temperature of the cooling liquid at the liquid inlet of the pumping device and the theoretical temperature of the cooling liquid at the liquid outlet of the thermostat under the condition that the cooling system is not in fault, a fitting function curve of the real-time rotating speed of the engine and the theoretical pressure of the cooling liquid at the liquid inlet of the pumping device under the condition that an impeller 301 of the pumping device in the cooling system is damaged, and a fitting function curve of the real-time rotating speed of the engine and the theoretical pressure of the cooling liquid at the liquid inlet of the pumping device under the condition that the liquid outlet of the pumping device in the cooling system is blocked.

It should be noted that the fault diagnosis model can also be constructed based on the sample operation data of the sample cooling system based on a deep learning algorithm.

After the fault diagnosis model is built, diagnostic data corresponding to the target operation data can be determined based on the fault diagnosis model. For example: if the target operating data is the real-time temperature of the cooling liquid at the liquid inlet 102 of the pumping device and the real-time temperature of the cooling liquid at the liquid outlet 105 of the thermostat, the real-time temperature of the cooling liquid at the liquid inlet 102 of the pumping device can be input into a fault diagnosis model, and the theoretical temperature of the cooling liquid at the liquid outlet of the thermostat, which corresponds to the real-time temperature of the cooling liquid at the liquid inlet 102 of the pumping device, is determined based on a fitting function curve of the real-time temperature of the cooling liquid at the liquid inlet of the pumping device and the theoretical temperature of the cooling liquid at the liquid outlet of the thermostat under the condition that the cooling system is not in fault.

And step 203, judging whether the cooling system is in failure or not based on the target operation data and the diagnosis data.

Specifically, based on the target operation data and the diagnosis data corresponding to the cooling system, whether the cooling system is faulty or not may be determined by means of condition determination according to a predetermined target condition.

In the event that the target condition is satisfied as determined based on the target operating data and the diagnostic data, it may be determined that the cooling system is malfunctioning.

In the event that the target condition is determined not to be satisfied based on the target operating data and the diagnostic data, it may be determined that the cooling system is not malfunctioning.

Alternatively, the target condition may be determined according to actual circumstances. The target conditions are not particularly limited in the embodiments of the present invention.

After obtaining the target operation data and the diagnosis data corresponding to the cooling system, it can be determined whether the target operation data and the diagnosis data satisfy the target condition

Alternatively, if it is determined that the cooling system has a failure, a prompt message indicating that the cooling system has a failure may be sent to the ECU of the work machine where the cooling system is located, and after receiving the prompt message, the ECU of the work machine may send an alarm signal, so that an operator may be prompted to repair the cooling system. The alarm signal may include, but is not limited to, an audible, optical, electrical alarm, and displaying the alarm signal on a display device of the work machine.

According to the embodiment of the invention, whether the cooling system has a fault is judged based on the target operation data corresponding to the cooling system and the diagnosis data obtained based on the fault diagnosis model, so that the fault diagnosis of the cooling system can be realized more efficiently and more simply, and the accuracy of the fault diagnosis of the cooling system can be improved.

Based on the content of the foregoing embodiments, the target operation data includes at least one of the following groups: a first temperature of cooling fluid at a pumping device inlet 102 and a second temperature of cooling fluid 105 at a thermostat outlet in the cooling system; the speed of the engine and the first pressure of the coolant at the pumping means inlet 102; wherein the cooling system is used for cooling the engine.

Specifically, after receiving a first temperature of the coolant at the liquid inlet 102 of the pumping device sent by the temperature sensor and a second temperature of the coolant at the liquid outlet 105 of the thermostat sent by the ECU of the diesel engine with the first temperature, the first temperature and the second temperature may be used as corresponding target operation data of the cooling system.

It should be noted that the first temperature is greater than 50 ℃.

After receiving the engine speed and the first pressure of the coolant at the inlet 102 of the pumping device, which are sent by the ECU of the diesel engine 108, the engine speed and the first pressure may be used as the corresponding target operation data of the cooling system.

In the embodiment of the invention, the target operation data comprises at least one group of the first temperature of the cooling liquid at the liquid inlet of the pumping device, the second temperature of the cooling liquid at the liquid outlet of the thermostat and the rotating speed of the engine and the first pressure of the cooling liquid at the liquid inlet of the pumping device in the cooling system, so that the process of acquiring the target operation data is simpler and more efficient, and the fault diagnosis can be more accurately and more efficiently carried out on the cooling system based on the target operation data.

Based on the content of the foregoing embodiments, when the target operation data includes the first temperature and the second temperature, the obtaining, based on the fault diagnosis model, the diagnosis data corresponding to the target operation data specifically includes: and inputting the first temperature into a fault diagnosis model, and acquiring a third temperature of the cooling liquid at a liquid outlet of the thermostat as diagnosis data corresponding to the target operation data.

Specifically, after the first temperature is input into the fault diagnosis model, based on a fitted function curve of the real-time temperature of the cooling liquid at the inlet of the pumping device and the theoretical temperature of the cooling liquid at the outlet of the thermostat under the condition that the cooling system is not in fault, the theoretical temperature of the cooling liquid at the outlet 105 of the thermostat corresponding to the first temperature can be obtained as a third temperature of the cooling liquid at the outlet 105 of the thermostat when the cooling system is not in fault, and the third temperature is taken as target operation data and includes corresponding diagnosis data when the first temperature and the second temperature.

Correspondingly, whether the cooling system fails or not is judged based on the target operation data and the diagnosis data, and the method specifically comprises the following steps: a temperature threshold is determined based on the third temperature.

Specifically, the temperature threshold may be determined based on the third temperature according to the actual situation. For example: the temperature threshold may be the third temperature minus 3 to 8 ℃; preferably, the temperature threshold may be the third temperature minus 5 ℃. The temperature threshold is not particularly limited in the embodiments of the present invention.

And determining that the cooling system is in fault under the condition that the time length that the second temperature is less than the temperature threshold value exceeds the first time length threshold value.

Specifically, after the third temperature is acquired as the corresponding diagnostic data when the target operation data is the first temperature and the second temperature, the determination of the target condition may be performed based on the second temperature and the third temperature.

If the duration that the second temperature is smaller than the temperature threshold exceeds the first duration threshold is judged and known, it can be shown that the heat dissipation capacity of the cooling system is greatly reduced, and it can be determined that the cooling system fails.

If the duration that the second temperature is smaller than the temperature threshold is judged and known not to exceed the first duration threshold, it can be said that the heat dissipation function of the cooling system is normal, and it can be determined that the cooling system has not failed.

It should be noted that the first time threshold may also be determined according to actual situations, for example: the first duration threshold may be 200 seconds to 400 seconds; preferably, the first duration threshold may be 300 seconds. The first time length threshold is not particularly limited in the embodiment of the present invention.

According to the embodiment of the invention, after the third temperature of the cooling liquid at the liquid outlet of the thermostat is obtained as the diagnosis data based on the first temperature of the cooling liquid at the liquid inlet of the pumping device in the cooling system and the fault diagnosis model, if the time length for judging that the second temperature of the cooling liquid at the liquid outlet of the thermostat is less than the temperature threshold determined based on the third temperature exceeds the first time length threshold is obtained, the cooling system is determined to have a fault, the fault diagnosis can be carried out on the cooling system more simply and efficiently, and the fault diagnosis accuracy of the cooling system can be improved.

Based on the content of the foregoing embodiments, in the case that the duration that the second temperature is less than the temperature threshold exceeds the duration threshold, determining that the cooling system fails specifically includes: determining that a coolant heat sink in the cooling system is malfunctioning if a duration of the second temperature being less than the temperature threshold exceeds a first duration threshold.

Specifically, if it is determined that the duration in which the second temperature is lower than the temperature threshold exceeds the first duration threshold, it may be said that the coolant at the thermostat liquid outlet 105 passes through the coolant heat sink 107 formed by the cooling fan 106 and the heat sink 103, and the real-time temperature of the coolant returning to the pumping device liquid inlet 102 is not reduced as expected, so it may be said that the coolant heat sink 107 formed by the cooling fan 106 and the heat sink 103 is failed, and the real-time temperature of the coolant returning to the pumping device liquid inlet 102 is reduced as expected. Thus, in the event that the length of time that the second temperature is less than the temperature threshold exceeds the first length of time threshold, it may be determined that a coolant heat sink in the cooling system is malfunctioning.

After determining that the coolant heat sink in the cooling system is malfunctioning, a warning message indicating that the coolant heat sink is malfunctioning may be sent to an ECU of the work machine in which the cooling system is located. After receiving the prompt message, the ECU of the working machine can send out an alarm signal, so that an operator can be prompted to overhaul the cooling liquid heat dissipation device. The alarm signal may include, but is not limited to, an audible, optical, electrical alarm, and displaying the alarm signal on a display device of the work machine.

According to the embodiment of the invention, the fault of the cooling liquid heat dissipation device of the cooling system is determined after the time length that the second temperature is less than the temperature threshold value exceeds the first time length threshold value, so that the fault component in the cooling system can be determined more simply and efficiently.

Based on the content of the foregoing embodiments, in the case that the target operation data includes the rotation speed and the first pressure of the engine, the obtaining, based on the fault diagnosis model, the diagnosis data corresponding to the target operation data specifically includes: and inputting the rotating speed into a fault diagnosis model, and acquiring second pressure of the cooling liquid at the liquid inlet of the pumping device as diagnosis data corresponding to the target operation data.

Specifically, after the rotating speed of the engine is input into the fault diagnosis model, based on a fitted function curve of the real-time rotating speed of the engine and the theoretical pressure of the coolant at the liquid inlet of the pumping device under the condition that the impeller of the pumping device in the cooling system is damaged, when the impeller 301 of the pumping device in the cooling system is damaged, the theoretical pressure of the coolant at the liquid inlet 102 of the pumping device corresponding to the rotating speed of the engine is used as the second pressure of the coolant at the liquid inlet 102 of the pumping device, and the second pressure is used as target operation data and comprises the rotating speed of the engine and corresponding diagnosis data when the first pressure is used.

Correspondingly, whether the cooling system fails or not is judged based on the target operation data and the diagnosis data, and the method specifically comprises the following steps: a first pressure threshold is determined based on the second pressure.

Specifically, the first pressure threshold may be determined based on the second pressure according to actual conditions. For example: the first pressure threshold may be 85% to 95% of the second pressure; preferably, the first pressure threshold may be 90% of the second pressure. The first pressure threshold is not particularly limited in the embodiment of the present invention.

And determining that the cooling system is in failure in the case that the time length that the first pressure is less than the first pressure threshold value exceeds a second time length threshold value.

Specifically, after acquiring the second pressure as the target operation data including the rotation speed of the engine and the corresponding diagnostic data at the time of the first pressure, the determination of the target condition may be made based on the first pressure and the second pressure.

If the duration that the first pressure is smaller than the first pressure threshold exceeds the second duration threshold is judged and known, it can be shown that the heat dissipation capacity of the cooling system is greatly reduced, and it can be determined that the cooling system fails.

If the duration that the first pressure is smaller than the first pressure threshold does not exceed the second duration threshold is judged and known, it can be indicated that the heat dissipation function of the cooling system is normal, and it can be determined that the cooling system does not break down.

It should be noted that the second duration threshold may also be determined according to actual situations, for example: the second duration threshold may be 100 seconds to 140 seconds; preferably, the second duration threshold may be 120 seconds. The second duration threshold is not particularly limited in the embodiment of the present invention.

According to the embodiment of the invention, after the second pressure of the cooling liquid at the liquid inlet of the pumping device in the cooling system is obtained as the diagnosis data based on the rotating speed and the fault diagnosis model of the engine, if the time length for judging and knowing that the first pressure of the cooling liquid at the liquid inlet of the pumping device in the cooling system is smaller than the first pressure threshold determined based on the second pressure exceeds the second time length threshold, the fault of the cooling system is determined, the fault diagnosis can be carried out on the cooling system more simply and efficiently, and the fault diagnosis accuracy of the cooling system can be improved.

Based on the content of the foregoing embodiments, in the case that the duration that the first pressure is less than the first pressure threshold exceeds the second duration threshold, determining that the cooling system is out of order specifically includes: in the event that the length of time that the first pressure is less than the first pressure threshold exceeds a second length of time threshold, it is determined that the impeller 301 of the pumping device in the cooling system is malfunctioning.

Specifically, if the second pressure is obtained as target operation data including the rotation speed of the engine and corresponding diagnostic data when the first pressure is smaller than the first pressure threshold value and the second time threshold value is judged and obtained based on a fitted function curve of the real-time rotation speed of the engine and the theoretical pressure of the cooling liquid at the liquid inlet of the pumping device under the condition that the impeller of the pumping device in the cooling system is damaged, it can be determined that the operation state of the cooling system is the same as the operation state of the impeller 301 of the pumping device of the cooling system when the damage fault exists. Therefore, in the case where the period of time for which the first pressure is less than the first pressure threshold value exceeds the second period of time threshold value, it can be determined that the impeller 301 of the pumping device in the cooling system is broken.

After determining that the impeller 301 of the pumping device in the cooling system is damaged, a warning message indicating that the impeller 301 of the pumping device in the cooling system is malfunctioning may be sent to the ECU of the work machine in which the cooling system is located. After receiving the prompt message, the ECU of the working machine may send an alarm signal, so that an operator may be prompted to overhaul the impeller 301 of the pumping device in the cooling system. The alarm signal may include, but is not limited to, an audible, optical, electrical alarm, and displaying the alarm signal on a display device of the work machine.

According to the embodiment of the invention, the damaged impeller of the pumping device in the cooling system is determined after the time length that the first pressure is smaller than the first pressure threshold value exceeds the second time length threshold value, so that the failed component and the failure reason in the cooling system can be determined more simply and efficiently.

Based on the content of each of the above embodiments, when the target operation data includes the rotation speed and the first pressure of the engine, the obtaining of the diagnostic data corresponding to the target operation data based on the fault diagnosis model specifically includes: and inputting the rotating speed into a fault diagnosis model, and acquiring third pressure of the cooling liquid at the liquid inlet of the pumping device as diagnosis data corresponding to the target operation data.

Specifically, after the rotation speed of the engine is input into the fault diagnosis model, when the liquid outlet of the pumping device in the cooling system is blocked, a fitting function curve of the real-time rotation speed of the engine and the theoretical pressure of the cooling liquid at the liquid inlet of the pumping device can be obtained, so that when the liquid outlet 109 of the pumping device in the cooling system is blocked, the theoretical pressure of the cooling liquid at the liquid inlet 102 of the pumping device corresponding to the rotation speed of the engine is used as the third pressure of the cooling liquid at the liquid inlet 102 of the pumping device, and the third pressure is used as target operation data and includes the rotation speed of the engine and corresponding diagnosis data when the first pressure is applied.

Correspondingly, whether the cooling system fails or not is judged based on the target operation data and the diagnosis data, and the method specifically comprises the following steps: a second pressure threshold is determined based on the third pressure.

Specifically, the second pressure threshold may be determined based on the third pressure according to actual conditions. For example: the second pressure threshold may be 105% to 115% of the third pressure; preferably, the second pressure threshold may be 110% of the third pressure. The second pressure threshold value is not particularly limited in the embodiment of the present invention.

In the event that a length of time that the first pressure is greater than the second pressure threshold exceeds a third length of time threshold, a determination is made that the cooling system is malfunctioning.

Specifically, after acquiring the third pressure as the target operation data including the rotation speed of the engine and the corresponding diagnostic data at the time of the first pressure, the determination of the target condition may be made based on the first pressure and the third pressure.

If the time length that the first pressure is greater than the second pressure threshold exceeds the third time length threshold is judged and known, it can be shown that the heat dissipation capacity of the cooling system is greatly reduced, and it can be determined that the cooling system fails.

If the duration that the first pressure is greater than the second pressure threshold does not exceed the third duration threshold is judged and known, it can be indicated that the heat dissipation function of the cooling system is normal, and it can be determined that the cooling system does not break down.

It should be noted that the third duration threshold may also be determined according to actual situations, for example: the third duration threshold may be 100 seconds to 140 seconds; preferably, the third duration threshold may be 120 seconds. The third duration threshold is not particularly limited in the embodiment of the present invention.

According to the embodiment of the invention, after the third pressure of the cooling liquid at the liquid inlet of the pumping device in the cooling system is obtained as the diagnosis data based on the rotating speed and the fault diagnosis model of the engine, if the time length for judging and knowing that the first pressure of the cooling liquid at the liquid inlet of the pumping device in the cooling system is greater than the second pressure threshold value determined based on the third pressure exceeds the third time length threshold value, the fault of the cooling system is determined, the fault diagnosis can be carried out on the cooling system more simply and efficiently, and the fault diagnosis accuracy of the cooling system can be improved.

Based on the content of the foregoing embodiments, in the case that the duration that the first pressure is greater than the second pressure threshold exceeds the third duration threshold, determining that the cooling system fails specifically includes: and under the condition that the time length that the first pressure is greater than the second pressure threshold value exceeds a third time length threshold value, determining that a liquid outlet of a pumping device in the cooling system is blocked.

Specifically, if the third pressure is obtained as the target operation data including the rotational speed of the engine and the corresponding diagnostic data when the first pressure is greater than the second pressure threshold, based on the fitted function curve of the real-time rotational speed of the engine and the theoretical pressure of the cooling liquid at the liquid inlet of the pumping device in the cooling system under the condition that the liquid outlet of the pumping device is blocked, and it is determined that the operation state of the cooling system is the same as the operation state when the liquid outlet 109 of the pumping device in the cooling system is blocked if it is determined that the time period when the first pressure is greater than the second pressure threshold exceeds the third time period threshold. Therefore, in case the time period that the first pressure is greater than the second pressure threshold exceeds the third time period threshold, it may be determined that the liquid outlet 109 of the pumping means in the cooling system is blocked.

After it is determined that the pumping device outlet 109 in the cooling system is blocked, a prompt message indicating that the pumping device outlet 109 in the cooling system is blocked may be sent to the ECU of the work machine in which the cooling system is located. After receiving the prompt message, the ECU of the working machine can send out an alarm signal, so that an operator can be prompted to overhaul a liquid outlet of a pumping device in the cooling system. The alarm signal may include, but is not limited to, an audible, optical, electrical alarm, and displaying the alarm signal on a display device of the work machine.

According to the embodiment of the invention, the liquid outlet of the pumping device in the cooling system is determined to be blocked after the time length that the first pressure is greater than the second pressure threshold value exceeds the third time length threshold value, so that the components with faults and the reasons for the faults in the cooling system can be determined more simply and efficiently.

Fig. 7 is a schematic structural diagram of a cooling system fault diagnosis device provided by the present invention. The cooling system fault diagnosis device provided by the present invention is described below with reference to fig. 7, and the cooling system fault diagnosis device described below and the cooling system fault diagnosis method provided by the present invention described above may be referred to in correspondence with each other. As shown in fig. 7, the apparatus includes: a data acquisition module 701, a data operation module 702 and a fault diagnosis module 703.

The data acquiring module 701 is configured to acquire target operation data corresponding to the cooling system.

And a data operation module 702, configured to obtain, based on the fault diagnosis model, diagnostic data corresponding to the target operation data.

And a fault diagnosis module 703 for determining whether the cooling system is faulty based on the target operation data and the diagnosis data.

The fault diagnosis model is obtained in advance based on sample operation data of the sample cooling system.

Specifically, the data acquisition module 701, the data operation module 702, and the fault diagnosis module 703 are electrically connected.

The data obtaining module 701 may obtain the target operation data corresponding to the cooling system through various manners, such as: the temperature and pressure sensor 303 acquires the real-time temperature of the cooling liquid at the liquid inlet 102 of the pumping device, and after the ECU of the diesel engine 108 acquires the real-time temperature of the cooling liquid at the liquid outlet 105 of the thermostat, the real-time temperature of the cooling liquid at the liquid inlet 102 of the pumping device sent by the temperature sensor and the real-time temperature of the cooling liquid at the liquid outlet 105 of the thermostat sent by the ECU of the diesel engine 108 can be received as target operation data; or, after the ECU of the diesel engine 108 acquires the real-time rotation speed of the diesel engine 108, the ECU of the diesel engine 108 may receive the real-time rotation speed of the diesel engine 108 sent by the ECU of the diesel engine 108 as the target operation data.

The data operation module 702 may determine diagnostic data corresponding to the target operational data based on the fault diagnosis model. For example: if the target operating data is the real-time temperature of the cooling liquid at the liquid inlet 102 of the pumping device and the real-time temperature of the cooling liquid at the liquid outlet 105 of the thermostat, the real-time temperature of the cooling liquid at the liquid inlet 102 of the pumping device can be input into a fault diagnosis model, and the theoretical temperature of the cooling liquid at the liquid outlet of the thermostat, which corresponds to the real-time temperature of the cooling liquid at the liquid inlet 102 of the pumping device, is determined based on a fitting function curve of the real-time temperature of the cooling liquid at the liquid inlet of the pumping device and the theoretical temperature of the cooling liquid at the liquid outlet of the thermostat under the condition that the cooling system is not in fault.

The fault diagnosis module 703 may determine whether the cooling system has a fault by means of condition determination according to a predetermined target condition based on the target operation data and the diagnosis data.

Optionally, the data obtaining module 701 may be further specifically configured to obtain at least one of a first temperature of the coolant at the inlet of the pumping device in the cooling system, a second temperature of the coolant at the outlet of the thermostat, and a rotation speed of the engine and a first pressure of the coolant at the inlet of the pumping device in the cooling system as the target operation data.

Optionally, the data operation module 702 may be further specifically configured to input the first temperature into the fault diagnosis model, and obtain a third temperature of the cooling liquid at the liquid outlet of the thermostat as diagnosis data corresponding to the target operation data.

The data operation module 702 may be further specifically configured to input the rotation speed into the fault diagnosis model, and obtain a second pressure of the coolant at the liquid inlet of the pumping device as diagnosis data corresponding to the target operation data.

Optionally, the fault diagnosis module 703 may be further specifically configured to determine a temperature threshold according to the third temperature; determining that the cooling system fails when the duration that the second temperature is less than the temperature threshold exceeds the first duration threshold; wherein the temperature threshold is determined based on the third temperature.

The fault diagnosis module 703 may be further specifically configured to determine that the coolant heat sink in the cooling system is faulty when a duration that the second temperature is less than the temperature threshold exceeds the duration threshold.

The fault diagnosis module 703 may be further specifically configured to determine a first pressure threshold based on the second pressure; determining that the cooling system fails when a duration of the first pressure being less than the first pressure threshold exceeds a second duration threshold; wherein the first pressure threshold is determined based on the second pressure.

The fault diagnosis module 703 may be further specifically configured to determine that an impeller of a pumping device in the cooling system is faulty if a duration of the first pressure being less than the first pressure threshold exceeds a second duration threshold.

The fault diagnosis module 703 may be further specifically configured to determine a second pressure threshold based on the third pressure; determining that the cooling system is faulty if a duration of the first pressure being greater than the second pressure threshold exceeds a third duration threshold; wherein the second pressure threshold is determined from the third pressure.

The fault diagnosis module 703 may be further specifically configured to determine that a liquid outlet of a pumping device in the cooling system is blocked if a duration that the first pressure is greater than the second pressure threshold exceeds a third duration threshold.

According to the embodiment of the invention, whether the cooling system has a fault is judged based on the target operation data corresponding to the cooling system and the diagnosis data obtained based on the fault diagnosis model, so that the fault diagnosis of the cooling system can be realized more efficiently and more conveniently, and the accuracy of the fault diagnosis of the cooling system can be improved.

Based on the content of the foregoing embodiments, a cooling system fault diagnosis system includes: the cooling system failure diagnosis device and the temperature pressure sensor as described above.

And the temperature and pressure sensor is used for acquiring the real-time temperature and/or pressure of the cooling liquid at the liquid inlet of the pumping device in the cooling system.

Under normal working conditions, the cooling system is used for a diesel engine, the temperature range of cooling liquid is-40-130 ℃, and the pressure (gauge pressure) range of the cooling liquid is-50-100 Kpa. When the temperature/pressure sensor 303 is selected, it is necessary to cover the temperature range and the pressure range. For example: the common negative temperature coefficient PT200 type temperature sensor and piezoelectric pressure sensor can be selected.

Fig. 8 is a schematic structural diagram of a temperature and pressure sensor in a fault diagnosis system of a cooling system provided by the invention. As shown in fig. 8, the temperature and pressure sensor 303 is a four-wire temperature and pressure sensor, and includes four terminals, namely VSS-power, GND-ground, sig 1-temperature signal, sig 2-pressure signal. VSS is direct current 5V or direct current 24V voltage, sig1 is a resistance signal output by a temperature signal, and sig2 is a pressure signal output voltage signal.

Based on the cooling system fault diagnosis device and the temperature and pressure sensor, the fault diagnosis of the cooling system can be realized more efficiently and more conveniently. For the structure of the cooling system fault diagnosis device, the interaction process of the cooling system fault diagnosis device and the temperature pressure sensor, and the specific process of performing fault diagnosis of the cooling system based on the cooling system fault diagnosis system in the embodiments of the present invention, reference may be made to the contents of the above embodiments, and details are not described here.

Optionally, the cooling system fault diagnosis system may further include a limiting device.

The limiting means may be used to limit the output torque of the diesel engine 108 or to control the diesel engine 108 to stop after it is determined that the cooling system is malfunctioning.

Based on the contents of the above embodiments, a work machine includes: such as the cooling system fault diagnostic system described above.

Particularly, the working machine comprises the cooling system fault diagnosis system, so that the fault diagnosis of the cooling system can be realized more efficiently and conveniently, and the accuracy of the fault diagnosis of the cooling system in the working machine can be improved

The structure and the working process of the cooling system fault diagnosis system can be referred to the content of the above embodiment of the cooling system fault diagnosis system, and are not described herein again.

Fig. 9 illustrates a physical structure diagram of an electronic device, and as shown in fig. 9, the electronic device may include: a processor (processor) 910, a communication Interface (Communications Interface) 920, a memory (memory) 930, and a communication bus 940, wherein the processor 910, the communication Interface 920, and the memory 930 communicate with each other via the communication bus 940. Processor 910 may invoke logic instructions in memory 930 to perform a cooling system fault diagnosis method comprising: acquiring target operation data corresponding to the cooling system; acquiring diagnostic data corresponding to target operation data based on a fault diagnosis model; judging whether the cooling system fails or not based on the target operation data and the diagnosis data; the fault diagnosis model is obtained in advance based on sample operation data of the cooling system.

Furthermore, the logic instructions in the memory 930 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being stored on a non-transitory computer readable storage medium, wherein when the computer program is executed by a processor, the computer is capable of executing the cooling system fault diagnosis method provided by the above methods, the method including: acquiring target operation data corresponding to the cooling system; acquiring diagnostic data corresponding to the target operation data based on the fault diagnosis model; judging whether the cooling system fails or not based on the target operation data and the diagnosis data; the fault diagnosis model is obtained in advance based on sample operation data of the cooling system.

In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to perform the cooling system fault diagnosis method provided by the above methods, the method including: acquiring target operation data corresponding to a cooling system; acquiring diagnostic data corresponding to target operation data based on a fault diagnosis model; judging whether the cooling system fails or not based on the target operation data and the diagnosis data; the fault diagnosis model is obtained in advance based on sample operation data of the cooling system.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method of diagnosing a fault in a cooling system, comprising:

acquiring target operation data of the cooling system;

wherein the fault diagnosis model is pre-acquired based on sample operating data of the cooling system; the fault diagnosis model is constructed on the basis of a first fitted curve, a second fitted curve and a third fitted curve; the first fitting curve is a fitting function curve of the real-time temperature of the cooling liquid at the liquid inlet of the pumping device in the cooling system and the theoretical temperature of the cooling liquid at the liquid outlet of the thermostat under the condition that the cooling system does not break down; the second fitting curve is a fitting function curve of the real-time rotating speed of the engine and the theoretical pressure of the cooling liquid at the liquid inlet of the pumping device under the condition that an impeller of the pumping device is damaged; the third fitting curve is a fitting function curve of the real-time rotating speed of the engine and the theoretical pressure of the cooling liquid at the liquid inlet of the pumping device under the condition that the liquid outlet of the pumping device is blocked; the first, second, and third fitted curves are obtained based on the sample run data; the target operational data includes at least one of:

wherein the cooling system is used for cooling the engine.

2. The method for diagnosing a fault in a cooling system according to claim 1, wherein when the target operation data includes the first temperature and the second temperature, the obtaining of the diagnostic data corresponding to the target operation data based on the fault diagnosis model specifically includes:

inputting the first temperature into the fault diagnosis model, and acquiring a third temperature of the cooling liquid at a liquid outlet of the thermostat as the diagnosis data corresponding to the target operation data;

determining a temperature threshold according to the third temperature;

determining that the cooling system is malfunctioning if a length of time that the second temperature is less than the temperature threshold exceeds a first length of time threshold.

3. The cooling system fault diagnosis method according to claim 1, wherein in the case where the target operation data includes the rotation speed of the engine and the first pressure, the obtaining of the diagnosis data corresponding to the target operation data based on the fault diagnosis model specifically includes:

inputting the rotating speed into the fault diagnosis model, and acquiring a second pressure of the cooling liquid at an inlet of the pumping device as the diagnosis data corresponding to the target operation data;

determining a first pressure threshold based on the second pressure;

4. The method according to claim 3, wherein the determining that the cooling system is faulty when the period in which the first pressure is smaller than the first pressure threshold exceeds a second period threshold specifically includes:

5. The cooling system fault diagnosis method according to claim 1, wherein in the case where the target operation data includes the rotation speed of the engine and the first pressure, the obtaining of the diagnosis data corresponding to the target operation data based on the fault diagnosis model specifically includes:

determining a second pressure threshold based on the third pressure;

6. The method for diagnosing a fault in a cooling system according to claim 5, wherein determining that the cooling system is faulty when the time period during which the first pressure is greater than the second pressure threshold exceeds a third time period threshold specifically includes:

7. A cooling system fault diagnosis device characterized by comprising:

wherein the fault diagnosis model is pre-acquired based on sample operating data of the cooling system; the fault diagnosis model is constructed based on a first fitted curve, a second fitted curve and a third fitted curve; the first fitting curve is a fitting function curve of the real-time temperature of the cooling liquid at the liquid inlet of the pumping device in the cooling system and the theoretical temperature of the cooling liquid at the liquid outlet of the thermostat under the condition that the cooling system does not have a fault; the second fitted curve is a fitted function curve of the real-time rotating speed of the engine and the theoretical pressure of the cooling liquid at the liquid inlet of the pumping device under the condition that an impeller of the pumping device is damaged; the third fitting curve is a fitting function curve of the real-time rotating speed of the engine and the theoretical pressure of the cooling liquid at the liquid inlet of the pumping device under the condition that the liquid outlet of the pumping device is blocked; the first, second, and third fitted curves are obtained based on the sample run data; the target operational data includes at least one of:

wherein the cooling system is used for cooling the engine.

8. A cooling system fault diagnostic system, comprising: the cooling system malfunction diagnosis device and the temperature pressure sensor according to claim 7;

9. A work machine, comprising: the cooling system fault diagnostic system of claim 8.

10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the cooling system fault diagnosis method according to any one of claims 1 to 6 are implemented when the processor executes the program.