Thermostat fault diagnosis method and device, engine and vehicle

Abstract

A thermostat fault diagnosis method and device, an engine and a vehicle, the thermostat fault diagnosis method comprising: when the water outlet temperature T1 of the engine body is greater than a predetermined value, judging whether the thermostat is faulty according to the water outlet temperature T1 of the engine body, the water outlet temperature T2 of the first radiator and the medium temperature T3 after the water of the engine body exchanges heat with the second radiator. Compared with the prior art, the judgment factors are increased, the misjudgment probability is reduced, and the vehicle fault is solved.

Description

Technical Field

[0001] This application relates to the field of engine technology, specifically to a thermostat fault diagnosis method and device, an engine, and a vehicle. Background Technology

[0002] As a valve component that controls the flow of coolant from the engine block to the radiator, the thermostat can cause coolant to fail to enter the radiator or result in insufficient flow when it fails to open or has insufficient opening stroke. This can lead to a rapid increase in engine block temperature and trigger an alarm. Simultaneously, it can manifest as the radiator outlet temperature not changing in sync with the engine block outlet temperature or a large difference between the radiator outlet temperature and the engine block outlet temperature. Current technology typically uses these fault conditions to diagnose thermostat malfunctions.

[0003] In reality, other factors can also cause similar malfunctions. Judging thermostat malfunctions solely based on the body water temperature and radiator water temperature may lead to misdiagnosis and is not conducive to troubleshooting vehicle malfunctions. Summary of the Invention

[0004] The purpose of this application is to provide a thermostat fault diagnosis method, an engine and a fault diagnosis method thereof, to solve the problem of misdiagnosis of thermostat faults.

[0005] To achieve the objectives of this application, the following technical solution is provided:

[0006] In a first aspect, this application provides a thermostat fault diagnosis method for an engine, the thermostat fault diagnosis method being used in an engine including a water pump, an engine body, a thermostat, a first radiator and a second radiator, the engine body being connected to the outlet of the water pump, the thermostat and the second radiator being connected to the outlet of the engine body respectively, the first radiator being connected to the outlet of the thermostat, the outlet of the first radiator being connected to the inlet of the water pump, and the outlet of the second radiator being connected to the inlet of the water pump;

[0007] The thermostat fault diagnosis method includes:

[0008] When the outlet water temperature T1 of the unit is greater than the predetermined value, the temperature controller is determined to be faulty based on the outlet water temperature T1 of the unit, the outlet water temperature T2 of the first radiator, and the medium temperature T3 after heat exchange between the second radiator and the outlet water of the unit.

[0009] In one embodiment, if the outlet water temperature T2 of the first radiator follows the change of the outlet water temperature T1 of the machine body, and ΔT>a, T3>b, A>H, and A>I, then the result of the malfunction of the thermostat is output; wherein ΔT is the difference between the outlet water temperature T1 of the machine body and the outlet water temperature T2 of the first radiator, a is a first threshold value, b is a second threshold value, A is the start time of the outlet water temperature T2 of the first radiator, H is the longest time required for the thermostat to start normally, and I is the shortest time required for the thermostat to start by the mechanical module.

[0010] In one embodiment, the thermostat is an electronic thermostat, and the thermostat comprises a mechanical module and an electronic control module.

[0011] If the outlet water temperature T2 of the first radiator follows the change of the outlet water temperature T1 of the machine body, and ΔT>a, T3>b, and H

[0012] I is the shortest time required for the thermostat to start by the mechanical module.

[0013] In one embodiment, the thermostat is an electronic thermostat, and the thermostat comprises a mechanical module and an electronic control module. If the outlet water temperature T2 of the first radiator follows the change of the outlet water temperature T1 of the machine body, and ΔT>a, T3>b, A>H, and A>I, then the result of the malfunction of the thermostat is output; wherein I is the shortest time required for the thermostat to start by the mechanical module.

[0014] In one embodiment, the thermostat is an electronic thermostat, and the thermostat comprises a mechanical module and an electronic control module. If the outlet water temperature T2 of the first radiator follows the change of the outlet water temperature T1 of the machine body, and ΔT>a, T3>b, A>H, and I

[0015] In one embodiment, if the outlet water temperature T2 of the first radiator follows the change of the outlet water temperature T1 of the machine body, and ΔT>a, T3>b, A>H, and A>I, then the result of the malfunction of the thermostat is output; wherein I is the shortest time required for the thermostat to start by the mechanical module.

[0016] In one embodiment, when the result of the failure of the electric control module is output, if e≤R≤f, the result of the failure of the control circuit of the electric control module is further output; wherein R is the resistance value of the electric control module of the temperature regulator, and e and f are both preset resistance fluctuation values.

[0017] In one embodiment, when the result of the failure of the electric control module is output, if R<e or R>f, the result of the failure of the resistance of the electric control module is further output; wherein R is the resistance value of the electric control module of the temperature regulator, and e and f are both preset resistance fluctuation values.

[0018] In one embodiment, if the outlet water temperature T2 of the first radiator does not follow the change of the outlet water temperature T1 of the engine body within a predetermined time, the result of the failure of the temperature regulator is output.

[0019] In the second aspect, the application further provides a temperature regulator failure diagnosis device, comprising a memory and a processor, the memory stores a computer program, and the processor is used to execute the computer program to realize the temperature regulator failure diagnosis method in any one of the various embodiments of the first aspect.

[0020] In the third aspect, the application further provides an engine, comprising a water pump, an engine body, a temperature regulator, a first radiator and a second radiator, the outlet of the water pump is communicated with the engine body, the temperature regulator and the second radiator are respectively communicated with the outlet of the engine body, the first radiator is communicated with the outlet of the temperature regulator, the outlet of the first radiator is communicated with the inlet of the water pump, and the outlet of the second radiator is communicated with the inlet of the water pump; the engine uses the temperature regulator failure diagnosis method in any one of the various embodiments of the first aspect to diagnose the failure.

[0021] In the fourth aspect, the application further provides a vehicle comprising the engine of the third aspect.

[0022] The temperature regulator failure diagnosis method of the application can judge the engine failure when the outlet water temperature T1 of the engine body is greater than a predetermined value, and the cause of the engine failure can be the failure of the temperature regulator. Then, according to the outlet water temperature T1 of the engine body, the outlet water temperature T2 of the first radiator and the warm air temperature T3 supplied by the second radiator, whether the temperature regulator is faulty is judged, the judgment factors are increased, the probability of misjudgment is reduced, and the vehicle failure is solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0024] Figure 1 FIG. 1 is a schematic diagram of an engine according to an embodiment;

[0025] Figure 2 FIG. 2 is a flowchart of a thermostat fault diagnosis method according to an embodiment.

[0026] Explanation of reference signs:

[0027] 10 - water pump, 20 - engine block, 30 - thermostat, 40 - first radiator, 50 - second radiator, 61 - first sensor, 62 - second sensor, 63 - third sensor. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0029] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be an intervening component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be an intervening component.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The use of the terms "and / or" includes a combination of one or more of the associated listed items.

[0031] Some embodiments of the present application will be described in detail below with reference to the drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] Reference will be made to Figure 1The engine provided by the embodiment of the application comprises a water pump 10, an engine body 20, a temperature regulator 30, a first radiator 40 and a second radiator 50.

[0033] The engine body 20 is in communication with the water outlet of the water pump 10, the temperature regulator 30 and the second radiator 50 are respectively in communication with the water outlet of the engine body 20, the first radiator 40 is in communication with the water outlet of the temperature regulator 30, the water outlet of the first radiator 40 is in communication with the water inlet of the water pump 10, and the water outlet of the second radiator 50 is in communication with the water inlet of the water pump 10.

[0034] Optionally, the engine further comprises a first sensor 61, a second sensor 62 and a third sensor 63.

[0035] The water pump 10 is a cooling liquid driving mechanism, and the water pump 10 can be of any feasible type, and the cooling liquid can be water or other cooling liquid, which are not limited.

[0036] The engine body 20 is in communication with the water outlet of the water pump 10, specifically, the engine body 20 is in communication with the water outlet of the water pump 10 through a water pipe or the like. Hereinafter, the communication is through a water pipe or the like, and this is specifically stated hereinafter and will not be described again. The engine body 20 can comprise a cylinder body, a cylinder cover, a cylinder body water jacket and a cylinder cover water jacket arranged around the cylinder body, and the like, and the engine body 20 is in communication with the water outlet of the water pump 10, specifically, the cylinder body water jacket, the cylinder cover water jacket and the like are in communication with the cooling mechanism located outside the cylinder body and the cylinder cover, and the water outlet of the water pump 10, and when the cooling liquid transported by the water pump 10 flows through the cylinder body water jacket, the cylinder cover water jacket and the like, the heat of the cylinder body and the cylinder cover can be taken away, so that the cooling and heat dissipation effect is achieved.

[0037] The first radiator 40 can be any feasible radiator for reducing the temperature of the cooling liquid. The second radiator 50 can be a component on a vehicle that needs to absorb heat, specifically, a heater, a battery assembly that needs to be preheated or the like, and the second radiator 50 is taken as the heater in the following embodiment for description.

[0038] The first sensor 61 is in communication with the water outlet of the engine body 20. The first sensor 61 is a temperature sensor, and the specific type is not limited. The first sensor 61 is used for measuring the temperature of the cooling liquid at the water outlet of the engine body 20, and the temperature is the water outlet temperature T1 of the engine body 20, and hereinafter, the water outlet temperature T1 of the engine body 20 is the temperature of the cooling liquid at the water outlet of the engine body 20 measured by the first sensor 61.

[0039] According to the water outlet temperature T1 of the engine block 20, it can be determined whether the engine is malfunctioning. Specifically, if the water outlet temperature T1 of the engine block 20 is greater than a predetermined value, it is determined that the coolant at the water outlet of the engine block 20 does not enter the subsequent cooling mechanism to be cooled, and the coolant stays at the water outlet of the engine block 20, and the engine is malfunctioning. The cause of the malfunction can be a malfunction of the thermostat 30 and a malfunction of the first radiator 40, etc., which is not limited. The present application also provides a thermostat 30 malfunction diagnosis method for determining whether the engine malfunction is caused by a malfunction of the thermostat 30, which will be described in detail below.

[0040] The thermostat 30 and the second radiator 50 are respectively in communication with the water outlet of the first sensor 61. Specifically, the thermostat 30 is an electronic thermostat, and the thermostat 30 includes a mechanical module and an electronic control module. The mechanical module can include a wax package, and the electronic control module can include an electric heating assembly for heating the wax package. Compared with the traditional thermostat, the electronic thermostat adds the electronic control module. When the electronic control module of the electronic thermostat opens the valve, the electric heating assembly is controlled by an electronic signal to heat the wax package, so that the wax package melts and the valve is opened. When the mechanical module opens the valve, the wax package is heated by the high-temperature liquid flowing into the electronic thermostat to melt the wax package and open the valve. The electronic thermostat can open the valve by at least one of the mechanical module and the electronic module, and can also open the opening degree of the valve. For the specific structure of the electronic thermostat, any feasible electronic thermostat in the prior art can be specifically referred to, which is not limited. The coolant flowing out of the first sensor 61 can flow to the thermostat 30 and the second radiator 50.

[0041] The first radiator 40 is in communication with the water outlet of the thermostat 30. If the thermostat 30 is not malfunctioning, the internal valve of the thermostat 30 is opened and the opening degree is large enough, so that the coolant can flow through the thermostat 30 to the first radiator 40 for cooling. If the thermostat 30 is malfunctioning, the internal valve cannot be opened, or the opening degree is too small, so that the coolant cannot flow to the first radiator 40, or the coolant flowing to the first radiator 40 is too small, which will result in poor cooling effect.

[0042] The second sensor 62 is in communication with the water outlet of the first radiator 40. The second sensor 62 is a temperature sensor, and the specific type is not limited. The second sensor 62 is used to measure the temperature of the coolant at the water outlet of the first radiator 40, which is the water outlet temperature T2 of the first radiator 40. In the following, the water outlet temperature T2 of the first radiator 40 is the temperature of the coolant at the water outlet of the first radiator 40 measured by the second sensor 62.

[0043] The third sensor 63 is arranged on the second radiator 50. The cooling liquid flowing out of the engine 20 absorbs the high temperature of the engine 20, and after flowing through the first sensor 61 to the second radiator 50 (for example, the second radiator 50 is the heater), the second radiator 50 can be heated to provide warm air for the vehicle. The third sensor 63 is a temperature sensor, and the specific type is not limited. The third sensor 63 is used to measure the medium temperature T3 of the second radiator 50 after heat exchange with the engine 20, that is, the warm air temperature supplied by the heater.

[0044] The outlet of the second radiator 50 and the second sensor 62 is in communication with the inlet of the water pump 10. The cooling liquid is heated at the second radiator 50, and the temperature is reduced after being cooled at the first radiator 40, and then is transported back to the water pump 10, realizing the recycling of the cooling liquid, and the inlet of the water pump 10 enters the cooling liquid with a lower temperature, which can achieve a better cooling effect of the engine 20.

[0045] In the embodiment of the present application, the engine uses the engine fault diagnosis method provided by the embodiment of the present application to diagnose the fault. The engine fault diagnosis method provided by the embodiment of the present application includes the thermostat 30 fault diagnosis method in any embodiment of the present application.

[0046] By using the thermostat 30 fault diagnosis method in the embodiment of the present application, the problem of false judgment of the thermostat 30 fault can be solved, which is beneficial to solving the vehicle fault and saving resources.

[0047] The thermostat 30 fault diagnosis method of the embodiment of the present application will be described in detail below.

[0048] Please refer to Figure 1 and Figure 2 , the present application provides a kind of thermostat 30 fault diagnosis method, which can be executed by thermostat 30 fault diagnosis device to realize. Specifically, thermostat 30 fault diagnosis device includes memory and processor, computer program is stored in memory, processor is used to execute computer program to realize thermostat 30 fault diagnosis method in the embodiment of the present application.

[0049] The thermostat 30 fault diagnosis method in the embodiment of the present application includes: when the outlet water temperature T1 of the engine is greater than a predetermined value, whether the thermostat is faulty is judged according to the outlet water temperature T1 of the engine, the outlet water temperature T2 of the first radiator and the warm air temperature T3 supplied by the second radiator.

[0050] Specifically, the outlet water temperature T1 of the engine 20 is obtained first.

[0051] The first sensor 61 senses the temperature of the coolant at the outlet of the engine block 20 in real time to obtain the outlet temperature T1 of the engine block 20, and transmits the signal of the temperature T1 to the processor. The processor can determine whether the engine is faulty according to the level of the temperature T1. When the temperature T1 is at a lower level and is not greater than a predetermined value, it is determined that the engine is not faulty and is running normally. When the temperature T1 is relatively high and is greater than the predetermined value, it is determined that the cooling of the engine is ineffective, and the engine is faulty. Whether the thermostat 30 is faulty or other devices are faulty needs to be determined through subsequent steps. The unit of the temperature T1 is degree Celsius (℃).

[0052] Then, the outlet temperature T2 of the first radiator 40 is obtained.

[0053] The second sensor 62 senses the temperature of the coolant at the outlet of the first radiator 40 in real time, that is, the outlet temperature T2 of the first radiator 40, and transmits the signal of the temperature T2 to the processor. The unit of the temperature T2 is degree Celsius (℃).

[0054] After the temperature T1 and the temperature T2 are obtained, whether the thermostat 30 is faulty can be determined according to whether the outlet temperature T2 of the first radiator 40 follows the change of the outlet temperature T1 of the engine block 20.

[0055] When the engine block 20 is just started, the temperature T1 is low, and the coolant is not needed for cooling, and the thermostat 30 can not be started. As the engine block 20 runs, the temperature T1 gradually rises. When the temperature T1 reaches the target starting temperature of the thermostat 30, whether the thermostat 30 is started can be determined by comparing whether the temperature T2 follows the change of the temperature T1. The temperature T2 following the change of the temperature T1 means that the temperature T2 changes in the same trend as the temperature T1 within a certain range, for example, when the temperature T1 rises, the temperature T2 also rises within a certain time range. It should be understood that the rising amplitude of the temperature T1 can be different from the rising amplitude of the temperature T2, but the temperature T1 and the temperature T2 should increase and decrease in the same way.

[0056] If the temperature T2 does not follow the change of the temperature T1, it is determined that the thermostat 30 is not started, and the reason can be that the thermostat 30 is faulty or that there is a large amount of air in the thermostat 30. If the temperature T2 follows the change of the temperature T1, it also needs to be determined through subsequent steps to determine whether the thermostat 30 is faulty.

[0057] Then, the medium temperature T3 after the coolant is exchanged between the second radiator 50 and the engine block 20 is obtained.

[0058] The third sensor 63 senses the temperature T3 of the warm air supplied by the second radiator in real time, and transmits the signal of the temperature T3 to the processor. The unit of the temperature T3 is degree Celsius (℃).

[0059] Since the judgment of whether the thermostat 30 is faulty according to the temperature T1 and the temperature T2 can be misjudged, the temperature T3 is introduced to judge whether the thermostat 30 is faulty, the judgment factors are increased, and the misjudgment probability can be reduced.

[0060] The cooling liquid flowing out of the water outlet of the engine body 20 flows through the first sensor 61, and then flows through the thermostat 30 and the second radiator 50 in two ways, that is, the cooling liquid with the temperature T1 flows to the thermostat 30 and the second radiator 50 at the same time. Therefore, according to the temperature T3, whether the thermostat 30 is faulty can be judged.

[0061] In summary, after the temperature T1, the temperature T2 and the temperature T3 are obtained, whether the thermostat is faulty can be judged. As for how to judge, any feasible judgment method can be used, or the method in the subsequent embodiments of the application can be used, which are not limited.

[0062] The current thermostat diagnosis method only uses the engine body outlet water temperature T1 and the first radiator outlet water temperature T2 to determine whether the thermostat is faulty, which can be misjudged, and is not conducive to solving vehicle faults.

[0063] Compared with the method of judging whether the thermostat is faulty only by T1 and T2, the influence of the water pump flow on T1 and T2 is also considered in the embodiment, the temperature T3 of the warm air is introduced, and after the influence of the water pump flow is excluded, whether the change of T1 and T2 is caused by the thermostat fault is judged.

[0064] In the embodiment of the application, when the engine body 20 outlet water temperature T1 is greater than a predetermined value, it can be judged that the engine is faulty, and the reason for the engine fault can be that the thermostat 30 is faulty. Then, according to the engine body 20 outlet water temperature T1, the first radiator 40 outlet water temperature T2, and the medium temperature T3 after the heat exchange between the second radiator 50 and the engine body 20, whether the thermostat 30 is faulty is judged, the judgment factors are increased, the misjudgment probability can be reduced, and it is conducive to solving vehicle faults.

[0065] If the first radiator 40 outlet water temperature T2 changes with the engine body 20 outlet water temperature T1, whether the thermostat 30 is faulty is judged according to whether the relationship formula △T≤a is satisfied.

[0066] Wherein, △T is the difference between the engine body 20 outlet water temperature T1 and the first radiator 40 outlet water temperature T2, a is the first threshold value, which is a preset temperature difference determined by experiment, that is, the temperature difference between the temperature T1 and the temperature T2 measured under the normal condition of the engine, and the unit of a is Celsius (℃).

[0067] Specifically, if the temperature T2 changes with the temperature T1, it indicates that the cooling liquid enters the first radiator 40, and the thermostat 30 is opened. ΔT = T1-T2, and according to the value of ΔT, it can be determined whether the flow of the cooling liquid entering the first radiator 40 is normal. If the relationship ΔT≤a is satisfied, it is determined that the flow of the cooling liquid entering the first radiator 40 is normal, which indicates that the opening of the internal valve of the thermostat 30 is normal, and the thermostat 30 is not faulty.

[0068] If the relationship ΔT≤a is not satisfied, that is, ΔT>a, the temperature T3 of the third sensor 63 is obtained, and whether the thermostat 30 is faulty is determined according to whether the relationship T3≤b is satisfied. b is a second threshold, which is a preset temperature determined through experiments, that is, a normal temperature of the warm air supplied by the second radiator 50 measured under the condition that the engine is normal, and the unit of b is Celsius (°C).

[0069] Specifically, if the relationship ΔT≤a is not satisfied, that is, ΔT>a, the flow entering the first radiator 40 is insufficient, and the reason for the insufficient flow entering the first radiator 40 can be that the opening of the internal valve of the thermostat 30 is insufficient, the flow of the water pump 10 is insufficient, the channel of the first radiator 40 is blocked, etc., and the reason for the insufficient flow of the water pump 10 can be that there is air at the water pump 10, the water pump 10 is faulty, etc. The exclusion method can be used to determine whether the insufficient relationship ΔT≤a is caused by the insufficient flow of the water pump 10, thereby narrowing the judgment range and facilitating the determination of whether the opening of the internal valve of the thermostat 30 is insufficient, that is, the determination of whether the thermostat 30 is faulty.

[0070] When the flow of the water pump 10 is insufficient, the flow at the second radiator 50 is also lower than the normal value, and the medium temperature T3 after the heat exchange of the second radiator 50 and the engine body 20 is lower than the normal temperature, that is, the relationship T3≤b is satisfied, and it can be determined that the thermostat 30 is not faulty. If the relationship T3≤b is not satisfied, that is, T3>b, it indicates that the problem is not caused by the insufficient flow of the water pump 10, and the reasons can be that the opening of the internal valve of the thermostat 30 is insufficient, the channel of the first radiator 40 is blocked, etc.

[0071] In combination with the foregoing various reasons for not satisfying the relationship ΔT≤a, after excluding the reason that the flow of the water pump 10 is insufficient, the reasons can be that the channel of the first radiator 40 is blocked and the thermostat 30 is faulty, etc. Specifically, whether the thermostat 30 is faulty is determined according to whether the relationship T3≤b is satisfied, including:

[0072] If the relationship T3≤b is not satisfied, whether the thermostat 30 is faulty is determined according to the rising start time A of the water temperature T2 of the first radiator 40 after the water temperature T1 of the engine body 20 reaches the target temperature d.

[0073] If the relationship T3≤b is not satisfied, i.e. T3>b, after excluding the problem of the water pump 10 failure, the second factor to be considered is the channel blockage of the first radiator 40, and most of the high-temperature coolant at the water outlet of the engine block 20 flows to the second radiator 50, causing the temperature of the second radiator 50 to be higher than the normal temperature; when the channel of the first radiator 40 is blocked, since the temperature T2 changes with the temperature T1, the coolant can still flow through the channel of the first radiator 40 to the second sensor 62, but the coolant can only slowly flow through a small flow rate from the water inlet to the water outlet of the first radiator 40. In the embodiment, the temperature T1 reaches the target temperature d to start timing, and the timing ends when the temperature T2 starts to rise, and according to the length of the time A, it can be judged whether the thermostat 30 is faulty or the channel of the first radiator 40 is blocked.

[0074] Specifically, according to the time A when the water outlet temperature T2 of the first radiator 40 starts to rise after the water outlet temperature T1 of the engine block 20 reaches the target temperature d, it can be judged whether the thermostat 30 is faulty, including:

[0075] If A≤H is satisfied, it is judged that T3>b is caused by the channel blockage of the first radiator 40, and the thermostat 30 is not faulty. Wherein, H refers to the longest time required for the thermostat 30 to normally open, i.e. when the electric control opening and mechanical opening functions of the thermostat 30 are normal, the time required for the thermostat 30 to open, in seconds (s), for example, 10s. The time H is determined by experimental test. When A≤H is satisfied, the second sensor 62 can measure that the temperature T2 starts to rise in a very short time, indicating that the thermostat 30 is normally opened without failure, and it is further determined that the relationship T3≤b is not satisfied due to the channel blockage of the first radiator 40.

[0076] If H

[0077] When H The performance of the electric control module of the thermostat 30 is attenuated, which is manifested as a slow melting speed of the wax package, insufficient opening sensitivity and opening lift of the internal valve, causing the opening time of the internal valve to be slower than the normal time H, and further causing the time A to be slower, so that it can be judged that the thermostat 30 is faulty.

[0078] When A>J, it indicates that both the electric control module and the mechanical module of the thermostat 30 are failed, resulting in a longer opening time, and it can be judged that the thermostat 30 is faulty.

[0079] If I

[0080] When the electric control module of the thermostat 30 is failed, the possible reason is that the control circuit of the electric control module of the thermostat 30 is failed or the external control line of the thermostat 30 is problematic, and then whether the thermostat 30 is faulty is judged according to whether the relationship e≤R≤f is satisfied; wherein R is the resistance value of the electric control module of the thermostat 30, e and f are both preset resistance fluctuation values, e and f are determined through experimental tests, and e

[0081] When the relationship e≤R≤f is satisfied, it indicates that the resistance value of the thermostat 30 is within the standard resistance range, and the control circuit of the electric control module of the thermostat 30 is failed.

[0082] When the relationship e≤R≤f is not satisfied, i.e. R

[0083] For the aforementioned case that the electric control module of the thermostat 30 is not failed, when the relationship e≤R≤f is satisfied, it can be judged that the control circuit of the electric control module of the thermostat 30 is not faulty, and the fault reason is that the external control line is faulty.

[0084] If the temperature T2 does not change with the temperature T1, there is another case that there is a large amount of air in the thermostat 30. Due to the existence of air, the cooling liquid is separated by air and is difficult to well contact the wax package, resulting in that the wax package cannot be melted, and further resulting in that the internal valve of the thermostat 30 is difficult to normally open, therefore, this factor also needs to be considered.

[0085] Specifically, whether the thermostat 30 is faulty is judged according to whether the outlet water temperature T2 of the first radiator 40 changes with the outlet water temperature T1 of the body 20, and further comprising:

[0086] If the outlet water temperature T2 of the first radiator 40 does not change with the outlet water temperature T1 of the body 20, whether the thermostat 30 is faulty is judged according to whether the outlet water temperature T2 of the first radiator 40 changes with the outlet water temperature T1 of the body 20 after the thermostat 30 is exhausted.

[0087] In other words, since there is a temperature T2 not following the temperature T1 change caused by the presence of a large amount of air at the thermostat 30, the verification can be performed after the exhaust of the thermostat 30, and the exhaust method can be solved by re-vacuum filling the coolant or disassembling the thermostat 30 or disassembling the normal circulation pipeline of the thermostat 30. For details, refer to the related content in the prior art, which will not be described here.

[0088] Further, according to whether the outlet water temperature T2 of the first radiator 40 follows the outlet water temperature T1 of the body 20 after the exhaust of the thermostat 30, it is judged whether the thermostat 30 is faulty, including:

[0089] If the outlet water temperature T2 of the first radiator 40 follows the outlet water temperature T1 of the body 20, it is judged whether the thermostat 30 is faulty according to whether the relationship formula △T≤a is satisfied.

[0090] If the outlet water temperature T2 of the first radiator 40 does not follow the outlet water temperature T1 of the body 20, it is judged that the thermostat 30 is faulty.

[0091] Specifically, the verification is performed after the exhaust of the thermostat 30, and the judgment method described above is continued to execute, so that whether the thermostat 30 is faulty can be judged.

[0092] In summary, when the diagnosis result of the thermostat 30 fault diagnosis method is that the thermostat 30 is faulty, the following situations exist.

[0093] 1. If the outlet water temperature T2 of the first radiator 40 follows the outlet water temperature T1 of the body 20 within a predetermined time, and △T>a, T3>b, and A>H, the result of the thermostat 30 being faulty is output. Wherein, the predetermined time is greater than or equal to J.

[0094] 2. If the outlet water temperature T2 of the first radiator 40 follows the outlet water temperature T1 of the body 20, and △T>a, T3>b, and H<A≤I, the result of the performance attenuation of the electric control module of the thermostat 30 is output.

[0095] 3. If the outlet water temperature T2 of the first radiator 40 follows the outlet water temperature T1 of the body 20 within a predetermined time, and △T>a, T3>b, A>H, and A>I, the result of the electric control module failure of the thermostat 30 is output. Wherein, the predetermined time is greater than or equal to J.

[0096] 4. If the outlet water temperature T2 of the first radiator 40 follows the outlet water temperature T1 of the body 20 within a predetermined time, and △T>a, T3>b, A>H, and I<A≤J, the result of the mechanical module normal and the electric control module failure of the thermostat 30 is output. Wherein, the predetermined time is greater than or equal to J.

[0097] 5. If the outlet water temperature T2 of the first radiator 40 follows the change of the outlet water temperature T1 of the body 20 within a predetermined time, and ΔT > a, T3 > b, A > H, and A > J, then the mechanical module and the electric control module of the thermostat 30 are both failed. The predetermined time is greater than or equal to J.

[0098] 6. When the electric control module is failed, if e ≤ R ≤ f, then the control circuit of the electric control module is further failed.

[0099] 7. When the electric control module is failed, if R < e or R > f, then the resistance of the electric control module is further failed.

[0100] 8. If the outlet water temperature T2 of the first radiator 40 does not follow the change of the outlet water temperature T1 of the body 20 within a predetermined time, then the thermostat 30 is failed.

[0101] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings described, and are only intended to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0102] The above only discloses one preferred embodiment of the present application, and of course cannot limit the scope of the present application. Those skilled in the art can understand that the implementation of all or part of the above-mentioned processes, and the equivalent changes made according to the claims of the present application, still belong to the scope covered by the present application.

Claims

1. A thermoregulator failure diagnosis method characterized by comprising: The thermostat fault diagnosis method is used for an engine, which includes a water pump, an engine body, a thermostat, a first radiator, and a second radiator. The engine body is connected to the outlet of the water pump, the thermostat and the second radiator are respectively connected to the outlet of the engine body, the first radiator is connected to the outlet of the thermostat, the outlet of the first radiator is connected to the inlet of the water pump, and the outlet of the second radiator is connected to the inlet of the water pump. The thermostat fault diagnosis method includes: When the water outlet temperature T1 of the machine body is greater than the predetermined value, the temperature controller is determined to be faulty based on the water outlet temperature T1 of the machine body, the water outlet temperature T2 of the first radiator, and the medium temperature T3 after the second radiator exchanges heat with the water outlet of the machine body. If the outlet water temperature T2 of the first radiator changes with the outlet water temperature T1 of the machine body within a predetermined time, and ΔT > a, T3 > b, A > H, then the result of the thermostat failure will be output. Wherein, △T is the difference between the outlet water temperature T1 of the machine body and the outlet water temperature T2 of the first radiator, a is the first threshold, b is the second threshold, A is the start time of the rise of the outlet water temperature T2 of the first radiator, and H is the maximum time required for the thermostat to be turned on normally.

2. The thermosiphon failure diagnostic method of claim 1, wherein The temperature controller is an electronic temperature controller, which includes a mechanical module and an electronic control module. If the outlet water temperature T2 of the first radiator changes with the outlet water temperature T1 of the body, and ΔT > a, T3 > b, and H < A ≤ I, then the result of the performance degradation of the electronic control module of the temperature controller is output. Where I represents the shortest time required for the thermostat to be activated solely through the mechanical module.

3. The thermosiphon failure diagnostic method of claim 1, wherein The temperature controller is an electronic temperature controller, which includes a mechanical module and an electronic control module. If the outlet water temperature T2 of the first radiator changes with the outlet water temperature T1 of the body within a predetermined time, and ΔT > a, T3 > b, A > H, and A > I, then the result of the temperature controller's electronic control module failing will be output. Where I represents the shortest time required for the thermostat to be activated solely through the mechanical module.

4. The thermostat fault diagnosis method according to claim 1, characterized in that, The temperature controller is an electronic temperature controller, which includes a mechanical module and an electronic control module. If the outlet water temperature T2 of the first radiator changes with the outlet water temperature T1 of the body within a predetermined time, and ΔT > a, T3 > b, A > H, and I < A ≤ J, then the output will show that the mechanical module of the temperature controller is normal and the electronic control module is faulty. Wherein, I is the shortest time required for the thermostat to be turned on only through the mechanical module, and J is the longest time required for the thermostat to be turned on only through the mechanical module.

5. The thermostat fault diagnosis method according to claim 1, characterized in that, If the outlet water temperature T2 of the first radiator changes with the outlet water temperature T1 of the body within a predetermined time, and ΔT > a, T3 > b, A > H, and A > J, then the output will show that both the mechanical module and the electronic control module of the temperature controller have failed. Wherein, J is the maximum time required for the thermostat to be turned on solely through the mechanical module.

6. The thermostat fault diagnosis method according to any one of claims 3 to 5, characterized in that, When the result of the failure of the electronic control module is output, if e≤R≤f, then the result of the failure of the control circuit of the electronic control module is further output. Where R is the resistance value of the electronic control module of the temperature controller, and e and f are both preset resistance fluctuation values.

7. The thermostat fault diagnosis method according to any one of claims 3 to 5, characterized in that, When the result of the failure of the electronic control module is output, if R < e or R > f, then the result of the failure of the resistor of the electronic control module is further output. Where R is the resistance value of the electronic control module of the temperature controller, and e and f are both preset resistance fluctuation values.

8. The thermostat fault diagnosis method according to claim 1, characterized in that, include: If the outlet water temperature T2 of the first radiator does not change with the outlet water temperature T1 of the machine body within a predetermined time, then the result of the thermostat failure will be output.

9. A thermostat fault diagnosis device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program and the processor executes the computer program to implement the thermostat fault diagnosis method as described in any one of claims 1 to 8.

10. An engine, characterized in that, The engine includes a water pump, a body, a thermostat, a first radiator, and a second radiator. The body is connected to the outlet of the water pump. The thermostat and the second radiator are respectively connected to the outlet of the body. The first radiator is connected to the outlet of the thermostat. The outlet of the first radiator is connected to the inlet of the water pump. The outlet of the second radiator is connected to the inlet of the water pump. The engine is diagnosed using the thermostat fault diagnosis method as described in any one of claims 1 to 8.

11. A vehicle, characterized in that, Includes the engine as described in claim 10.

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