Online diagnosis method and system for high-temperature fault of waterway of thermal management system and engineering machinery

Abstract

The invention discloses a thermal management system waterway high-temperature fault online diagnosis method and system and engineering machinery, and relates to the technical field of engineering machinery. According to the method, after the power loss of a whole vehicle and the actual change trend of the temperature of a water path of the thermal management system within a preset time period are obtained, the power loss is input, and actual input power and efficiency distribution of a motor and an electric controller during running of the whole vehicle, the working time period, the rotating speed of a water pump of the thermal management system and the environment temperature serve as constraint conditions; according to the method, the estimated change trend of the temperature of the waterway when the thermal management system is in a normal state within the preset duration of the waterway is obtained through a whole vehicle thermodynamic model constructed through the Fourier heat conduction law, so that whether the waterway has a fault or not is determined based on the actual and estimated change trend of the temperature, and abnormal temperature rise early warning is carried out. Therefore, the problem that effective early warning of motor and electric control high-temperature faults caused by a thermal management system of a whole vehicle end is difficult to give is solved.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and more specifically, to an online diagnosis method and system for high-temperature faults in water circuits of a thermal management system and engineering machinery. Background Art

[0002] The normal operation of the thermal management system is crucial to the reliability of the motor and electronic control system of construction machinery. If there is an abnormality in the thermal management system, it is easy to cause the motor and electronic control system to overheat, especially the IGBT module in the electronic control system is very sensitive to temperature.

[0003] At present, it is possible to make online diagnosis of high temperature faults of motors and electronic control systems, but it is still difficult to make effective early warnings for high temperature faults of motors and electronic control systems caused by the thermal management system on the vehicle side. Therefore, only after the fault occurs can the cause of the fault be gradually investigated through after-sales service, and effective solutions can be provided accordingly. This poses a great challenge to the reliability of motors and electronic control systems, the timeliness of fault closure, and the economic losses of customers. Summary of the invention

[0004] In view of this, the embodiments of the present application are committed to providing an online diagnosis method, system, engineering machinery and electronic equipment for high-temperature faults in the water circuit of a thermal management system, so as to solve the problem that it is difficult to make effective early warnings for high-temperature faults in motors and electronic controls caused by the thermal management system on the vehicle end.

[0005] In a first aspect, the present invention provides an online diagnosis method for a high temperature fault in a water channel of a thermal management system, which is used to provide an abnormal temperature rise warning for the water channel of the thermal management system of the vehicle when the vehicle is running, comprising:

[0006] Acquire the power loss of the vehicle within a preset time period and a first temperature change trend of the water channel, where the first temperature change trend is an actual change trend of the temperature of the water channel within the preset time period;

[0007] Inputting the power loss into a vehicle thermodynamic model to obtain a second temperature change trend of the water channel, wherein the second temperature change trend is an estimated temperature change trend of the water channel when the thermal management system is in a normal state within the preset time period;

[0008] Determining whether the water path has a fault based on the first temperature change trend and the second temperature change trend;

[0009] When it is determined that there is a fault in the water circuit, an abnormal temperature rise warning is issued;

[0010] Among them, the vehicle thermodynamic model is a model constructed through Fourier's law of heat conduction with the actual input power and efficiency distribution of the motor and electronic control when the vehicle is running, the working time, the water pump speed of the thermal management system, and the ambient temperature as constraints.

[0011] In a possible implementation manner, determining whether the water path has a fault based on the first temperature change trend and the second temperature change trend includes:

[0012] determining an offset of the first temperature change trend compared to the second temperature change trend;

[0013] Comparing the offset with a preset first threshold;

[0014] When the offset is greater than the preset first threshold, determining that there is a fault in the waterway;

[0015] When the offset is less than or equal to the preset first threshold, it is determined that there is no fault in the waterway.

[0016] In a possible implementation, the abnormal temperature rise warning includes:

[0017] Based on the operating parameters of the vehicle, determining a first temperature, the first temperature being an estimated temperature of a target object on the vehicle when the thermal management system is in a normal state, the target object including a motor, an electronic control, and a water circuit;

[0018] Acquiring a second temperature, where the second temperature is the actually detected temperature of the target object;

[0019] Determining a cause of a failure of the waterway based on a variation pattern of the second temperature and a difference between the second temperature and the first temperature;

[0020] Based on the cause of the fault, an abnormal temperature rise warning is issued.

[0021] In a possible implementation manner, the first temperature includes a first motor temperature representing an estimated temperature of the motor, and the second temperature includes a second motor temperature representing an actually detected temperature of the motor;

[0022] The determining the cause of the failure of the waterway based on the variation rule of the second temperature and the difference between the second temperature and the first temperature includes:

[0023] Determining whether the temperature of the second motor changes more than a preset number of times within the preset time period;

[0024] When the number of jumps exceeds the preset number and the difference between the second motor temperature and the first motor temperature is greater than a preset second threshold, it is determined that the fault cause is poor contact of the temperature sensor harness of the motor.

[0025] In a possible implementation manner, determining the cause of the failure of the waterway based on the variation pattern of the second temperature and the difference between the second temperature and the first temperature includes:

[0026] determining whether the temperature of the second motor remains stable within the preset time period;

[0027] When the second motor temperature remains stable and is greater than the preset motor temperature, and the difference between the second motor temperature and the first motor temperature is greater than the preset second threshold, it is determined that the fault cause is damage to the temperature sensor of the motor and an open circuit or short circuit in the temperature sensor harness.

[0028] In a possible implementation manner, the first temperature includes a first travel electric control temperature representing an estimated temperature of an electric control of a travel motor of the whole vehicle, and a first upper body electric control temperature representing an estimated temperature of an electric control of an upper body motor of the whole vehicle; the second temperature includes a second travel electric control temperature representing an actually detected temperature of an electric control of the travel motor, and a second upper body electric control temperature representing an actually detected temperature of an electric control of the upper body motor;

[0029] The determining the cause of the failure of the waterway based on the variation rule of the second temperature and the difference between the second temperature and the first temperature includes:

[0030] Determining whether the change trend of the second travel electric control temperature within the preset time period is gradually increasing;

[0031] When the variation trend of the second travel electric control temperature is gradually increasing, and the increase amplitude is greater than the preset third threshold value, and the difference between the final stable value of the second travel electric control temperature within the preset time period and the first travel electric control temperature is greater than the preset fourth threshold value, determining whether the difference between the second upper body electric control temperature and the first upper body electric control temperature is greater than the preset fifth threshold value;

[0032] When the difference between the second upper body electrical control temperature and the first upper body electrical control temperature is less than or equal to the preset fifth threshold, determining that the fault cause is a blockage in the water circulation between the travel motor and the controller of the travel motor; and

[0033] Determining whether the change trend of the second upper body electronic control temperature within the preset time period is gradually increasing;

[0034] When the variation trend of the second upper body electric control temperature is gradually increasing, and the increase amplitude is greater than the preset sixth threshold value, and the difference between the final stable value of the second upper body electric control temperature within the preset time length and the first upper body electric control temperature is greater than the preset seventh threshold value, determining whether the difference between the second travel electric control temperature and the first travel electric control temperature is greater than the preset eighth threshold value;

[0035] When the difference between the second travel electric control temperature and the first travel electric control temperature is less than or equal to the preset eighth threshold, it is determined that the fault cause is a blockage in the water circulation between the upper motor and the controller of the upper motor.

[0036] In a possible implementation manner, determining the cause of the failure of the waterway based on the variation pattern of the second temperature and the difference between the second temperature and the first temperature includes:

[0037] Determine whether the change trend of the second travel electric control temperature and the second upper body electric control temperature within the preset time period is gradually increasing;

[0038] When the variation trends of the second travel electric control temperature and the second upper body electric control temperature are gradually increasing, and the difference between the final stable value of the second travel electric control temperature within the preset time length and the first travel electric control temperature, and the difference between the final stable value of the second upper body electric control temperature within the preset time length and the first upper body electric control temperature are both greater than a preset ninth threshold, determining whether the increase rate of the output torque of the water pump of the whole vehicle exceeds the preset increase rate;

[0039] When the speed increase exceeds the preset speed increase, it is determined that the fault cause is that the water pump is stuck.

[0040] In a possible implementation manner, determining the cause of the failure of the waterway based on the variation pattern of the second temperature and the difference between the second temperature and the first temperature includes:

[0041] Determining whether the change trend of the second travel electric control temperature within the preset time period is gradually increasing;

[0042] When the variation trend of the second travel electric control temperature is gradually increasing, and the difference between the final stable value of the second travel electric control temperature within the preset time period and the first travel electric control temperature is greater than a preset tenth threshold, determining whether the torque of the water pump reaches the preset torque;

[0043] When the torque reaches the preset torque, controlling the vehicle to restart;

[0044] Determining whether the second travel electronic control temperature and the torque are restored to preset normal values ​​after the vehicle is restarted;

[0045] If the second travel electric control temperature and the torque are both restored to the preset normal values, it is determined that the cause of the fault is the presence of bubbles in the water circuit.

[0046] In a second aspect, the present invention provides an online diagnosis system for high temperature faults in water channels of a thermal management system, which is used to provide an abnormal temperature rise warning for the water channels of the thermal management system of the vehicle when the vehicle is running, and comprises:

[0047] A collection unit, used to obtain the power loss of the whole vehicle within a preset time period, and a first temperature change trend of the water channel, where the first temperature change trend is an actual change trend of the temperature of the water channel within the preset time period;

[0048] a processing unit, configured to input the power loss into a vehicle thermodynamic model to obtain a second temperature change trend of the water channel, wherein the second temperature change trend is an estimated temperature change trend of the water channel when the thermal management system is in a normal state within the preset time period;

[0049] A comparison unit, configured to determine whether the water path has a fault based on the first temperature change trend and the second temperature change trend;

[0050] An execution unit, used for issuing an abnormal temperature rise warning when it is determined that there is a fault in the water circuit;

[0051] Among them, the vehicle thermodynamic model is a model constructed through Fourier's law of heat conduction with the actual input power and efficiency distribution of the motor and electronic control when the vehicle is running, the working time, the water pump speed of the thermal management system, and the ambient temperature as constraints.

[0052] In a third aspect, the present invention provides an engineering machine, comprising an engineering machine body and an online diagnosis system for high-temperature faults in water channels of a thermal management system provided in the second aspect of the present invention.

[0053] According to the online diagnosis method for high-temperature faults in the water circuit of a thermal management system provided by the present invention, the power loss of the whole vehicle within a preset time period and a first temperature change trend representing the actual change trend of the temperature of the water circuit of the thermal management system of the whole vehicle within the preset time period are first obtained. Then, the power loss is input with the actual input rate and efficiency distribution of the motor and electronic control of the whole vehicle during operation, the working time, the water pump speed of the thermal management system, and the ambient temperature as constraints. A thermodynamic model of the whole vehicle is constructed through Fourier's law of heat conduction to obtain a second temperature change trend representing the estimated change trend of the temperature of the water circuit within the preset time period. Based on the first temperature change trend and the second temperature change trend, it can be determined whether there is a fault in the water circuit, and when it is determined that there is a fault in the water circuit, an abnormal temperature rise warning is issued. That is, through the application of the whole vehicle thermodynamic model, it is possible to estimate the temperature change trend of the water circuit based on the real-time working condition of the whole vehicle when the thermal management system of the whole vehicle is in a normal state. Therefore, it is possible to determine whether there is a fault in the water circuit based on the difference between the first temperature change trend that characterizes the actual change trend of the temperature of the water circuit within a preset period of time and the estimated second temperature change trend. This enables real-time judgment of whether a high-temperature water circuit fault occurs in the thermal management system based on the real-time working condition of the whole vehicle, thereby achieving effective early warning of high-temperature faults of the motor and electronic control caused by the thermal management system on the vehicle side, improving the reliability of the motor and electronic control system of the whole vehicle, as well as the timeliness of fault closure, and reducing the economic losses of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0055] Figure 1 The figure is a flow chart of an online diagnosis method for high temperature faults in water circuits of a thermal management system provided by an embodiment of the present invention.

[0056] Figure 2 The figure shows a flow chart of using the thermal management system water circuit high temperature fault online diagnosis method provided by an embodiment of the present invention to provide an abnormal temperature rise warning for the water circuit of the thermal management system of the whole vehicle.

[0057] Figure 3 Shown is a structural diagram of an online diagnosis system for high-temperature faults in water circuits of a thermal management system provided by an embodiment of the present invention.

[0058] Figure 4 Shown is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this specification shall have the common meanings understood by persons with ordinary skills in the field to which this specification belongs. The words "first", "second" and similar words used in the embodiments of this specification do not indicate any order, quantity or importance, but are only used to avoid confusion of constituent elements.

[0060] Unless the context requires otherwise, throughout the specification, "plurality" means "at least two", and "including" is interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the specification. The schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0061] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0062] At present, it is possible to make online diagnosis of high temperature faults in the electronic control system and motor system of the whole vehicle, but it is still impossible to diagnose the specific high temperature fault mechanism online for the whole vehicle, and it is difficult to make effective early warnings. Only when the fault occurs, after-sales service can gradually investigate the cause of the fault and provide an effective solution. This poses a great challenge to the reliability of the motor system and electronic control system, the timeliness of fault closure and the economic losses of customers.

[0063] The present invention aims to solve the above-mentioned problem by inputting the power loss of the whole vehicle within a preset time into the operation of the whole vehicle, taking the actual input power and efficiency distribution (efficiency MAP) of the motor and electronic control of the whole vehicle, the working time, the water pump speed of the thermal management system, and the ambient temperature as constraints, and constructing a whole vehicle thermodynamic model through Fourier's heat conduction law to obtain a prediction of the temperature change trend of the water circuit of the thermal management system. Based on the actual change trend of the water circuit temperature and the estimated temperature change trend, it is possible to determine whether the water circuit is faulty, thereby realizing online diagnosis of high-temperature faults of the motor and controller caused by faults in the thermal management system of the whole vehicle.

[0064] Furthermore, the online diagnosis method for high-temperature faults in the water circuit of a thermal management system provided by the present invention is executed on an electronic device, which may be a controller configured on the engineering machinery, or an intelligent terminal such as a laptop computer or a smart phone remotely connected to the controller of the engineering machinery, or a server on the network side.

[0065] Based on the above, see Figure 1 , Figure 1 : is a flow chart of an online diagnosis method for a high temperature fault in a water path of a thermal management system provided by an embodiment of the present invention. The process of the online diagnosis method for a high temperature fault in a water path of a thermal management system provided by this embodiment may include:

[0066] S100: Obtain power loss of the entire vehicle within a preset time period and a first temperature change trend of the water channel.

[0067] The first temperature variation trend is an actual variation trend of the temperature of the water channel within a preset time period.

[0068] Specifically, for construction machinery, the power loss of the whole vehicle mainly includes the power loss of the motor, the motor controller, that is, the power loss of the electronic control, heat dissipation loss and some other power losses, such as: the loss caused by the circulation of coolant in the pipeline, etc.

[0069] More specifically, based on the relationship between power and vehicle operating parameters, by collecting the torque and speed of the motor, and the voltage, current and other parameters of the motor controller when the vehicle is running, the motor power loss, electronic control power loss and heat dissipation loss can be calculated, and the power loss of the vehicle can be obtained.

[0070] It can be understood that the actual changing trend of the water channel temperature within the preset time period can be determined by obtaining the water channel temperature data detected by the temperature sensor at a preset frequency within the preset time period, that is, the first temperature change trend.

[0071] S110, inputting the power loss into the vehicle thermodynamic model to obtain a second temperature change trend of the water channel.

[0072] The second temperature change trend is an estimated change trend of the temperature of the water channel when the thermal management system is in a normal state within a preset time period.

[0073] The vehicle's thermodynamic model is constructed using Fourier's law of heat conduction, with the vehicle's motor and electronic control's actual input power and efficiency distribution, working hours, the water pump speed of the thermal management system, and ambient temperature as constraints.

[0074] Specifically, using the actual input power and efficiency MAP of the motor and electronic control of the vehicle during operation, the working time, the water pump speed of the thermal management system, and the ambient temperature as constraints, the temperature change trend of the electronic control, motor, and thermal management water circuit can be calculated through Fourier's law of heat conduction, and the thermodynamic model of the whole vehicle can be obtained.

[0075] In some possible embodiments, a simplified model of the vehicle thermodynamic model may be as shown in formula (1):

[0076]

[0077] Where c is the specific heat capacity of the coolant in the water circuit, m is the mass of the coolant, ΔT is the water circuit temperature, P M is the motor power loss, P C is the electric control power loss, where subscripts 1 and 2 represent the travel motor and the upper motor respectively.

[0078] It can be seen from formula (1) that after obtaining the power loss of the whole vehicle within the preset time, the change trend of the water channel temperature when the thermal management system is in a normal state within the preset time can be estimated based on the whole vehicle thermodynamic model as shown in formula (1).

[0079] S120: Determine whether there is a fault in the water circuit based on the first temperature change trend and the second temperature change trend.

[0080] Specifically, after the second temperature change trend is determined, that is, the temperature change trend of the water circuit within the preset time period when the thermal management system is in a normal state, by comparing the first temperature change trend, that is, the actual temperature change trend of the water circuit within the preset time period with the second temperature change trend, it can be determined whether there is a fault in the water circuit of the whole vehicle thermal management system.

[0081] Specifically, in an optional embodiment, determining whether there is a fault in the water path based on the first temperature change trend and the second temperature change trend includes:

[0082] determining an offset of the first temperature change trend compared to the second temperature change trend;

[0083] Comparing the offset with a preset first threshold;

[0084] When the offset is greater than a preset first threshold, determining that there is a fault in the waterway;

[0085] When the offset is less than or equal to a preset first threshold, it is determined that there is no fault in the waterway.

[0086] In this embodiment, by setting a preset first threshold and then comparing the first temperature change trend with the second temperature change trend, when the actual temperature change trend of the electronic control, motor, and thermal management water circuit is in a normal state and the estimated thermal management system is in a normal state, when the temperature change trend of the water circuit differs too much, it can be determined that there is a fault in the water circuit of the thermal management system of the entire vehicle.

[0087] S130: When it is determined that there is a fault in the water circuit, an abnormal temperature rise warning is issued.

[0088] Specifically, when it is determined that there is a fault in the water circuit, the method of issuing an abnormal temperature rise warning may include prompting the driver and / or limiting the power output of the entire vehicle.

[0089] In this embodiment, the actual input power and efficiency distribution of the motor and electronic control of the whole vehicle during operation, the working time, the water pump speed of the thermal management system, and the ambient temperature are used as constraints, and the thermodynamic model of the whole vehicle is constructed by Fourier's heat conduction law, so that after obtaining the power loss of the whole vehicle during operation, the expected change trend of the water circuit temperature when the thermal management system is in a normal state can be obtained based on the thermodynamic model of the whole vehicle, that is, the reasonable range of the working temperature when the electronic control, motor and the whole vehicle thermal management system are operating normally can be judged, and then compared with the actual temperature change trend of the water circuit, it can be determined whether the water circuit is faulty. In this way, online diagnosis of thermal management system faults is realized according to the real-time working conditions of the whole vehicle, and timely warning of high-temperature faults of motors and electronic controls caused by thermal management system faults is also realized, which improves the reliability of motors and electronic control systems, as well as the timeliness of fault closure.

[0090] In a specific embodiment, the specific process of using the thermal management system water channel high temperature fault online diagnosis method provided by the embodiment of the present invention to warn the water channel of the thermal management system of the whole vehicle of abnormal temperature rise can be as follows: Figure 2 As shown, when the whole vehicle is running, the operating parameter information such as the voltage, current, torque and speed of the electric control, and the actual temperature information of the water circuit are obtained in real time with a preset time of 15s, and then the power loss of the whole vehicle is determined based on the obtained operating parameter information, and the determined power loss is input into the thermodynamic model of the whole vehicle to obtain the predicted trend of the water circuit temperature change, so as to judge the operating status of the thermal management system based on the comparison between the actual temperature change trend of the water circuit and the predicted trend. Finally, when it is determined that the thermal management system fails, the driver is prompted and the control parameters of the whole vehicle are adjusted to limit the power output of the whole vehicle, thereby improving the operating reliability of the whole vehicle.

[0091] It is understandable that the sources of high temperature failures in vehicle thermal management are complex and often occur sporadically, making troubleshooting difficult, which poses a great challenge to maintenance personnel in troubleshooting and solving problems. Therefore, when carrying out abnormal temperature rise warnings, if the cause of the fault can be warned simultaneously, not only will after-sales service not need to spend a lot of time and energy to troubleshoot the cause of the fault, thus improving the efficiency of fault resolution, but it will also further improve the timeliness of fault closure, thereby improving the user experience.

[0092] Based on this, in an optional embodiment, abnormal temperature rise warning is performed, including:

[0093] Based on the operating parameters of the whole vehicle, a first temperature is determined, where the first temperature is an estimated temperature of a target object on the whole vehicle when the thermal management system is in a normal state.

[0094] Among them, the target objects include motors, electronic controls and waterways;

[0095] Acquire a second temperature, where the second temperature is the temperature of the target object actually detected;

[0096] Determine the cause of the waterway failure based on the variation pattern of the second temperature and the difference between the second temperature and the first temperature;

[0097] Based on the cause of the fault, an abnormal temperature rise warning is issued.

[0098] It is understandable that when the water circuit of the vehicle thermal management system fails, it will cause the water circuit temperature to rise on the one hand, and easily cause the motor and electronic control system to heat up on the other hand. Based on this, in this embodiment, by setting the target object as the motor, electronic control and water circuit of the vehicle, and then based on the operating parameters of the vehicle, the temperature of the motor, electronic control and water circuit when the electronic control, motor and thermal management system are operating normally is estimated, so that by comparing the estimated temperature with the corresponding actual temperature, the cause of the water circuit failure can be determined.

[0099] Specifically, taking an electric loader as an example, when the electric loader is loaded and starts working, the load torque M of the loading / travel motor is obtained. L , speed M n , the input voltage U and current I of the body / travel controller, etc., can be used to calculate the temperature T of the controller (electronic control) when the vehicle thermal management system is in a normal state. c , Motor temperature T m , the temperature of the water circuit of the vehicle thermal management system T s .

[0100] More specifically, high-temperature failures in the vehicle's thermal management system generally come from the following aspects: damage to the motor body temperature sensor, false alarm of the motor temperature sensor (poor wiring harness contact, damaged temperature sensor), motor jam, water circuit blockage, water pump abnormality, and a large number of bubbles in the water circuit (the air is not exhausted when the coolant is replaced, and a chemical reaction occurs when the coolant is replaced or added, resulting in bubbles).

[0101] Based on this, the embodiments of the present invention start from the above aspects, analyze a large amount of operating data of the whole vehicle, depict the temperature change map corresponding to different fault causes, and when it is determined that a water circuit fault occurs, the cause of the water circuit fault is determined online based on this.

[0102] Specifically, in an optional embodiment, the first temperature includes a first motor temperature representing an estimated temperature of the motor, and the second temperature includes a second motor temperature representing an actually detected temperature of the motor;

[0103] Based on the variation pattern of the second temperature and the difference between the second temperature and the first temperature, the cause of the waterway failure is determined, including:

[0104] Determining whether the temperature of the second motor changes more than a preset number of times within a preset time period;

[0105] When the number of jumps exceeds a preset number and the difference between the second motor temperature and the first motor temperature is greater than a preset second threshold, it is determined that the cause of the fault is poor contact of the temperature sensor harness of the motor.

[0106] It should be noted that when the vehicle is running, the temperature of both the travel motor and the upper motor should change continuously. When the wiring harness between the motor temperature sensor and the controller is in poor contact, based on the temperature change graph, it is found that the fault phenomenon is a sudden change in the temperature of the detected motor.

[0107] In this embodiment, by determining whether the second motor temperature has jumped more than a preset number of times within a preset time, and when it is determined that the number of jumps exceeds the preset number, further determining whether the difference between the second motor temperature and the first motor temperature is greater than a preset second threshold, it is possible to accurately determine whether the cause of the water circuit failure is poor contact of the motor temperature sensor harness. That is, when the collected motor temperature T mA Within the Δt time range, multiple jumps occur and are compared with the calculated estimated motor temperature T m When the difference is large (|T mA2 ―T mA1 |>Δ1&&|T mA ―T m |>Δ2), it can be determined that the cause of the water circuit failure is: poor contact of the wiring harness.

[0108] It is understandable that the motor temperature sensors currently used on complete vehicles are mostly thermistors (NTC / PTC). When the resistor is open-circuited, short-circuited, and the wiring harness end is open-circuited, short-circuited, it is found based on the temperature change graph that the temperature detected by the motor is the highest temperature (150 degrees) and the lowest temperature (-50 degrees). Therefore, it can be judged whether the cause of the water circuit failure is the damage of the motor temperature sensor and the open or short circuit of the temperature sensor wiring harness.

[0109] Based on this, in an optional embodiment, based on the variation rule of the second temperature and the difference between the second temperature and the first temperature, determining the cause of the waterway failure includes:

[0110] determining whether the temperature of the second motor remains stable within a preset time period;

[0111] When the second motor temperature remains stable and is greater than the preset motor temperature, and the difference between the second motor temperature and the first motor temperature is greater than the preset second threshold, it is determined that the fault cause is damage to the temperature sensor of the motor and an open circuit or short circuit in the temperature sensor harness.

[0112] In this embodiment, by collecting the motor temperature T mA Long time greater than the set threshold T mA0 and remain stable, and is consistent with the estimated motor temperature T m When the difference is large (T mA >T mA0 &&|T mA ―T m |>Δ3), it can be determined that the cause of the water circuit failure is: the temperature sensor of the motor is damaged and the wiring harness is open / short circuited.

[0113] In an optional embodiment, the first temperature includes a first travel electric control temperature representing an estimated temperature of an electric control of a travel motor of the whole vehicle, and a first upper-mounted electric control temperature representing an estimated temperature of an electric control of an upper-mounted motor of the whole vehicle; the second temperature includes a second travel electric control temperature representing an actually detected temperature of an electric control of the travel motor, and a second upper-mounted electric control temperature representing an actually detected temperature of an electric control of the upper-mounted motor;

[0114] Based on the variation pattern of the second temperature and the difference between the second temperature and the first temperature, the cause of the waterway failure is determined, including:

[0115] Determine whether the change trend of the second travel electric control temperature within a preset time period is gradually increasing;

[0116] When the change trend of the second travel electric control temperature is gradually increasing, and the increase amplitude is greater than the preset third threshold value, and the difference between the final stable value of the second travel electric control temperature within the preset time length and the first travel electric control temperature is greater than the preset fourth threshold value, determine whether the difference between the second upper body electric control temperature and the first upper body electric control temperature is greater than the preset fifth threshold value;

[0117] When the difference between the second upper body electric control temperature and the first upper body electric control temperature is less than or equal to a preset fifth threshold, determining that the fault cause is a blockage in the water circulation between the travel motor and the controller of the travel motor; and

[0118] Determine whether the change trend of the second upper body electronic control temperature within a preset time period is gradually increasing;

[0119] When the change trend of the second upper body electric control temperature is gradually increasing, and the increase amplitude is greater than the preset sixth threshold value, and the difference between the final stable value of the second upper body electric control temperature within the preset time length and the first upper body electric control temperature is greater than the preset seventh threshold value, determine whether the difference between the second travel electric control temperature and the first travel electric control temperature is greater than the preset eighth threshold value;

[0120] When the difference between the second travel electric control temperature and the first travel electric control temperature is less than or equal to the preset eighth threshold, it is determined that the fault cause is a blockage in the water circulation between the upper motor and the controller of the upper motor.

[0121] Specifically, this embodiment determines whether the changing trend of the actual temperature of the electronic control of the walking motor is gradually increasing, and when the increase in the actual temperature of the electronic control of the walking motor is greater than the preset third threshold, further determines whether the difference between its final stable value within the preset time period and the corresponding estimated temperature is greater than the preset fourth threshold. After determining that the difference between the two is greater than the preset fourth threshold, it is further determined whether the difference between the actual temperature of the electronic control of the upper motor and the corresponding estimated temperature is greater than the preset fifth threshold, so that it can be accurately determined whether the cause of the water circuit failure is the blockage of the water circuit circulation between the walking motor and the controller of the walking motor.

[0122] That is, when the actual electric control temperature T of the walking motor is collected c1A It gradually increases within the time range of Δt, and the growth rate is greater than m1, ΔT c1A is greater than the corresponding preset threshold, and the final stable value is equal to the calculated estimated value T of the corresponding temperature c1 When the difference is large, ΔT c1A / Δt>m1&&|T c1A ―T c1 |>Δ4), at the same time, the actual electronic control temperature of the upper motor T c2A The calculated temperature T c2 The difference is not big, that is, |T c2A ―Tc2 |<Δ5, it can be judged that the cause of the water circuit failure is: the water circuit circulation between the travel motor and the electronic control of the travel motor is blocked.

[0123] Correspondingly, the method for judging whether the water circulation between the upper motor and the upper motor's electronic control is blocked is as shown in the above embodiment, which is the same as the method for judging whether the water circulation between the traveling motor and the traveling motor's electronic control is blocked, and will not be repeated here.

[0124] In an optional embodiment, determining the cause of the waterway failure based on the variation pattern of the second temperature and the difference between the second temperature and the first temperature includes:

[0125] Determine whether the change trend of the second travel electric control temperature and the second upper body electric control temperature within a preset time period is gradually increasing;

[0126] When the variation trend of the second travel electric control temperature and the second upper body electric control temperature is gradually increasing, and the difference between the final stable value of the second travel electric control temperature within the preset time length and the first travel electric control temperature, and the difference between the final stable value of the second upper body electric control temperature within the preset time length and the first upper body electric control temperature are both greater than the preset ninth threshold value, determine whether the increase rate of the output torque of the water pump of the whole vehicle exceeds the preset increase rate;

[0127] When the speed increases beyond the preset speed, it is determined that the cause of the fault is a stuck water pump.

[0128] It is understandable that when the coolant contains a large amount of impurities, iron filings, etc., it will cause blockage of the water channel of the vehicle's thermal management system. Based on the temperature change map, it is found that when the water channel is blocked, it will cause high-temperature failure of the electronic control.

[0129] Based on this, this embodiment uses the collected electric control temperature T of the walking motor to c1A and the electric control temperature T of the upper motor c2A It increases rapidly within the Δt time range, and the final stable value is significantly different from the corresponding temperature estimate calculated. At the same time, when the output torque of the water pump increases rapidly, it is judged that the cause of the water circuit failure is: the water pump is stuck by foreign matter.

[0130] In an optional embodiment, determining the cause of the waterway failure based on the variation pattern of the second temperature and the difference between the second temperature and the first temperature includes:

[0131] Determine whether the change trend of the second travel electric control temperature within a preset time period is gradually increasing;

[0132] When the change trend of the second travel electric control temperature is gradually increasing, and the difference between the final stable value of the second travel electric control temperature within the preset time length and the first travel electric control temperature is greater than the preset tenth threshold, determining whether the torque of the water pump reaches the preset torque;

[0133] When the torque reaches the preset torque, the vehicle is controlled to restart;

[0134] Determine whether the temperature and torque of the second travel electronic control have returned to the preset normal values ​​after the vehicle is restarted;

[0135] If the second travel electronic control temperature and torque are restored to the preset normal values, it is determined that the cause of the fault is the presence of bubbles in the water circuit.

[0136] It is understandable that when there are a large number of bubbles in the coolant, they will gradually accumulate in the controller, causing "air blockage" in the water path. According to the temperature change graph, when "air blockage" occurs in the water path, it will cause high temperature failure of the electronic control.

[0137] Based on this, in this embodiment, by collecting the electric control temperature T of the walking motor c1A It increases rapidly, and the final stable value is quite different from the calculated corresponding temperature estimate. At the same time, the water pump torque increases to x2. If the vehicle is restarted, the electronic control temperature and water pump torque return to normal. The cause of the water circuit failure is judged to be: there are bubbles in the water circuit.

[0138] Based on the content of the above embodiments, the online diagnosis method for high temperature fault of water circuit of thermal management system provided by the embodiment of the present invention can not only realize online real-time early warning of abnormal temperature rise caused by fault of thermal management system of the whole vehicle, thereby improving the reliability of motor and electronic control system of the whole vehicle. It can also identify the cause of the fault online when it is determined that the thermal management system of the whole vehicle has a high temperature fault, so as to accurately provide solutions for after-sales service personnel, thereby shortening the troubleshooting time, solving user problems in time, and improving the user experience.

[0139] The following is an introduction to an online diagnosis system for high-temperature faults in the water circuit of a thermal management system provided in an embodiment of the present invention. The online diagnosis system for high-temperature faults in the water circuit of a thermal management system described below can be considered as a module architecture for implementing an online diagnosis method for high-temperature faults in the water circuit of a thermal management system provided in an embodiment of the present invention; the content described below can be cross-referenced with the above.

[0140] See also Figure 3 , Figure 3 This is a structural block diagram of an online diagnosis system for high-temperature faults in water channels of a thermal management system provided by an embodiment of the present invention. The system may include:

[0141] The collection unit 10 is used to obtain the power loss of the whole vehicle within a preset time period and the first temperature change trend of the water channel, where the first temperature change trend is the actual change trend of the temperature of the water channel within the preset time period;

[0142] The processing unit 20 is used to input the power loss into the vehicle thermodynamic model to obtain a second temperature change trend of the water channel, where the second temperature change trend is an estimated temperature change trend of the water channel when the thermal management system is in a normal state within a preset time period;

[0143] A comparison unit 30, for determining whether there is a fault in the water path based on the first temperature change trend and the second temperature change trend;

[0144] The execution unit 40 is used to issue an abnormal temperature rise warning when it is determined that there is a fault in the water circuit;

[0145] The vehicle's thermodynamic model is constructed using Fourier's law of heat conduction, with the actual input power and efficiency distribution of the motor and electronic control, working hours, the water pump speed of the thermal management system, and ambient temperature as constraints when the vehicle is running.

[0146] Optionally, the comparison unit 30 is specifically configured to:

[0147] determining an offset of the first temperature change trend compared to the second temperature change trend;

[0148] Comparing the offset with a preset first threshold;

[0149] When the offset is greater than a preset first threshold, determining that there is a fault in the waterway;

[0150] When the offset is less than or equal to a preset first threshold, it is determined that there is no fault in the waterway.

[0151] Optionally, the execution unit 40 is specifically configured to:

[0152] Based on the operating parameters of the vehicle, determining a first temperature, the first temperature being an estimated temperature of a target object on the vehicle when the thermal management system is in a normal state, the target object including a motor, an electronic control, and a water circuit;

[0153] Acquire a second temperature, where the second temperature is the temperature of the target object actually detected;

[0154] Determine the cause of the waterway failure based on the variation pattern of the second temperature and the difference between the second temperature and the first temperature;

[0155] Based on the cause of the fault, an abnormal temperature rise warning is issued.

[0156] Optionally, the first temperature includes a first motor temperature representing an estimated temperature of the motor, and the second temperature includes a second motor temperature representing an actually detected temperature of the motor;

[0157] The execution unit 40 is more specifically used for:

[0158] Determining whether the temperature of the second motor changes more than a preset number of times within a preset time period;

[0159] When the number of jumps exceeds a preset number and the difference between the second motor temperature and the first motor temperature is greater than a preset second threshold, it is determined that the cause of the fault is poor contact of the temperature sensor harness of the motor.

[0160] Optionally, the execution unit 40 is more specifically configured to:

[0161] determining whether the temperature of the second motor remains stable within a preset time period;

[0162] When the second motor temperature remains stable and is greater than the preset motor temperature, and the difference between the second motor temperature and the first motor temperature is greater than the preset second threshold, it is determined that the fault cause is damage to the temperature sensor of the motor and an open circuit or short circuit in the temperature sensor harness.

[0163] Optionally, the first temperature includes a first travel electric control temperature representing an estimated temperature of an electric control of a travel motor of the whole vehicle, and a first upper-mounted electric control temperature representing an estimated temperature of an electric control of an upper-mounted motor of the whole vehicle; the second temperature includes a second travel electric control temperature representing an actually detected temperature of an electric control of the travel motor, and a second upper-mounted electric control temperature representing an actually detected temperature of an electric control of the upper-mounted motor;

[0164] The execution unit 40 is more specifically used for:

[0165] Determine whether the change trend of the second travel electric control temperature within a preset time period is gradually increasing;

[0166] When the change trend of the second travel electric control temperature is gradually increasing, and the increase amplitude is greater than the preset third threshold value, and the difference between the final stable value of the second travel electric control temperature within the preset time length and the first travel electric control temperature is greater than the preset fourth threshold value, determine whether the difference between the second upper body electric control temperature and the first upper body electric control temperature is greater than the preset fifth threshold value;

[0167] When the difference between the second upper body electric control temperature and the first upper body electric control temperature is less than or equal to a preset fifth threshold, determining that the fault cause is a blockage in the water circulation between the travel motor and the controller of the travel motor; and

[0168] Determine whether the change trend of the second upper body electronic control temperature within a preset time period is gradually increasing;

[0169] When the change trend of the second upper body electric control temperature is gradually increasing, and the increase amplitude is greater than the preset sixth threshold value, and the difference between the final stable value of the second upper body electric control temperature within the preset time length and the first upper body electric control temperature is greater than the preset seventh threshold value, determine whether the difference between the second travel electric control temperature and the first travel electric control temperature is greater than the preset eighth threshold value;

[0170] When the difference between the second travel electric control temperature and the first travel electric control temperature is less than or equal to the preset eighth threshold, it is determined that the fault cause is a blockage in the water circulation between the upper motor and the controller of the upper motor.

[0171] Optionally, the execution unit 40 is more specifically configured to:

[0172] Determine whether the change trend of the second travel electric control temperature and the second upper body electric control temperature within a preset time period is gradually increasing;

[0173] When the variation trend of the second travel electric control temperature and the second upper body electric control temperature is gradually increasing, and the difference between the final stable value of the second travel electric control temperature within the preset time length and the first travel electric control temperature, and the difference between the final stable value of the second upper body electric control temperature within the preset time length and the first upper body electric control temperature are both greater than the preset ninth threshold value, determine whether the increase rate of the output torque of the water pump of the whole vehicle exceeds the preset increase rate;

[0174] When the speed increases beyond the preset speed, it is determined that the cause of the fault is a stuck water pump.

[0175] Optionally, the execution unit 40 is more specifically configured to:

[0176] Determine whether the change trend of the second travel electric control temperature within a preset time period is gradually increasing;

[0177] When the change trend of the second travel electric control temperature is gradually increasing, and the difference between the final stable value of the second travel electric control temperature within the preset time length and the first travel electric control temperature is greater than the preset tenth threshold, determining whether the torque of the water pump reaches the preset torque;

[0178] When the torque reaches the preset torque, the vehicle is controlled to restart;

[0179] Determine whether the temperature and torque of the second travel electronic control have returned to the preset normal values ​​after the vehicle is restarted;

[0180] If the second travel electric control temperature and torque are restored to the preset normal values, it is determined that the fault is caused by bubbles in the water circuit. Optionally, an embodiment of the present invention further provides an engineering machine, including an engineering machine body and an online diagnosis system for high temperature faults in the water circuit of a thermal management system as provided in any of the above embodiments.

[0181] Below, reference Figure 4To describe the electronic device provided by the embodiment of the present application, the electronic device provided by the embodiment may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0182] In the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300, and the communication bus 400 is at least one, and the processor 100, the communication interface 200, and the memory 300 communicate with each other through the communication bus 400; obviously, Figure 4 The communication connections shown for the processor 100, the communication interface 200, the memory 300, and the communication bus 400 are merely optional;

[0183] Optionally, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module; the processor 100 may be a central processing unit CPU, or an application specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0184] The memory 300 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0185] The processor 100 is specifically used to execute the application program in the memory to implement the steps of the above-mentioned online diagnosis method for high-temperature faults in the water path of the thermal management system.

[0186] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0187] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0188] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0189] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0190] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0191] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A method for online diagnosis of high temperature faults in water circuits of a thermal management system, which is used to provide an early warning of abnormal temperature rise in the water circuits of the thermal management system of the vehicle when the vehicle is running, and is characterized in that: include: Acquire the power loss of the vehicle within a preset time period and a first temperature change trend of the water channel, where the first temperature change trend is an actual change trend of the temperature of the water channel within the preset time period; Inputting the power loss into a vehicle thermodynamic model to obtain a second temperature change trend of the water channel, wherein the second temperature change trend is an estimated temperature change trend of the water channel when the thermal management system is in a normal state within the preset time period; Determining whether the water path has a fault based on the first temperature change trend and the second temperature change trend; When it is determined that there is a fault in the water circuit, an abnormal temperature rise warning is issued; Among them, the vehicle thermodynamic model is a model constructed through Fourier's law of heat conduction with the actual input power and efficiency distribution of the motor and electronic control when the vehicle is running, the working time, the water pump speed of the thermal management system, and the ambient temperature as constraints.

2. The method according to claim 1, characterized in that The determining whether the water path has a fault based on the first temperature change trend and the second temperature change trend includes: determining an offset of the first temperature change trend compared to the second temperature change trend; Comparing the offset with a preset first threshold; When the offset is greater than the preset first threshold, determining that there is a fault in the waterway; When the offset is less than or equal to the preset first threshold, it is determined that there is no fault in the waterway.

3. The method according to claim 1, characterized in that The abnormal temperature rise warning includes: Based on the operating parameters of the vehicle, determining a first temperature, the first temperature being an estimated temperature of a target object on the vehicle when the thermal management system is in a normal state, the target object including a motor, an electronic control, and a water circuit; Acquiring a second temperature, where the second temperature is the actually detected temperature of the target object; Determining a cause of a failure of the waterway based on a variation pattern of the second temperature and a difference between the second temperature and the first temperature; Based on the cause of the fault, an abnormal temperature rise warning is issued.

4. The method according to claim 3, characterized in that: The first temperature includes a first motor temperature representing an estimated temperature of the motor, and the second temperature includes a second motor temperature representing an actually detected temperature of the motor; The determining the cause of the failure of the waterway based on the variation rule of the second temperature and the difference between the second temperature and the first temperature includes: Determining whether the temperature of the second motor changes more than a preset number of times within the preset time period; When the number of jumps exceeds the preset number and the difference between the second motor temperature and the first motor temperature is greater than a preset second threshold, it is determined that the fault cause is poor contact of the temperature sensor harness of the motor.

5. The method according to claim 4, characterized in that The determining the cause of the failure of the waterway based on the variation rule of the second temperature and the difference between the second temperature and the first temperature includes: determining whether the temperature of the second motor remains stable within the preset time period; When the second motor temperature remains stable and is greater than the preset motor temperature, and the difference between the second motor temperature and the first motor temperature is greater than the preset second threshold, it is determined that the fault cause is damage to the temperature sensor of the motor and an open circuit or short circuit in the temperature sensor harness.

6. The method according to claim 5, characterized in that The first temperature includes a first travel electric control temperature representing an estimated temperature of an electric control of a travel motor of the whole vehicle, and a first upper body electric control temperature representing an estimated temperature of an electric control of an upper body motor of the whole vehicle; the second temperature includes a second travel electric control temperature representing an actually detected temperature of an electric control of the travel motor, and a second upper body electric control temperature representing an actually detected temperature of an electric control of the upper body motor; The determining the cause of the failure of the waterway based on the variation rule of the second temperature and the difference between the second temperature and the first temperature includes: Determining whether the change trend of the second travel electric control temperature within the preset time period is gradually increasing; When the variation trend of the second travel electric control temperature is gradually increasing, and the increase amplitude is greater than the preset third threshold value, and the difference between the final stable value of the second travel electric control temperature within the preset time period and the first travel electric control temperature is greater than the preset fourth threshold value, determining whether the difference between the second upper body electric control temperature and the first upper body electric control temperature is greater than the preset fifth threshold value; When the difference between the second upper body electrical control temperature and the first upper body electrical control temperature is less than or equal to the preset fifth threshold, determining that the fault cause is a blockage in the water circulation between the travel motor and the controller of the travel motor; and Determining whether the change trend of the second upper body electronic control temperature within the preset time period is gradually increasing; When the variation trend of the second upper body electric control temperature is gradually increasing, and the increase amplitude is greater than the preset sixth threshold value, and the difference between the final stable value of the second upper body electric control temperature within the preset time length and the first upper body electric control temperature is greater than the preset seventh threshold value, determining whether the difference between the second travel electric control temperature and the first travel electric control temperature is greater than the preset eighth threshold value; When the difference between the second travel electric control temperature and the first travel electric control temperature is less than or equal to the preset eighth threshold, it is determined that the fault cause is a blockage in the water circulation between the upper motor and the controller of the upper motor.

7. The method according to claim 6, characterized in that The determining the cause of the failure of the waterway based on the variation rule of the second temperature and the difference between the second temperature and the first temperature includes: Determine whether the change trend of the second travel electric control temperature and the second upper body electric control temperature within the preset time period is gradually increasing; When the variation trends of the second travel electric control temperature and the second upper body electric control temperature are gradually increasing, and the difference between the final stable value of the second travel electric control temperature within the preset time length and the first travel electric control temperature, and the difference between the final stable value of the second upper body electric control temperature within the preset time length and the first upper body electric control temperature are both greater than a preset ninth threshold, determining whether the increase rate of the output torque of the water pump of the whole vehicle exceeds the preset increase rate; When the speed increase exceeds the preset speed increase, it is determined that the fault cause is that the water pump is stuck.

8. The method according to claim 7, characterized in that The determining the cause of the failure of the waterway based on the variation rule of the second temperature and the difference between the second temperature and the first temperature includes: Determining whether the change trend of the second travel electric control temperature within the preset time period is gradually increasing; When the variation trend of the second travel electric control temperature is gradually increasing, and the difference between the final stable value of the second travel electric control temperature within the preset time period and the first travel electric control temperature is greater than a preset tenth threshold, determining whether the torque of the water pump reaches the preset torque; When the torque reaches the preset torque, controlling the vehicle to restart; Determining whether the second travel electronic control temperature and the torque are restored to preset normal values ​​after the vehicle is restarted; If the second travel electric control temperature and the torque are both restored to the preset normal values, it is determined that the cause of the fault is the presence of bubbles in the water circuit.

9. An online diagnosis system for high temperature faults in the water circuit of a thermal management system, used to warn of abnormal temperature rise in the water circuit of the thermal management system of the vehicle when the vehicle is running, characterized in that: include: A collection unit, used to obtain the power loss of the whole vehicle within a preset time period, and a first temperature change trend of the water channel, where the first temperature change trend is an actual change trend of the temperature of the water channel within the preset time period; a processing unit, configured to input the power loss into a vehicle thermodynamic model to obtain a second temperature change trend of the water channel, wherein the second temperature change trend is an estimated temperature change trend of the water channel when the thermal management system is in a normal state within the preset time period; A comparison unit, configured to determine whether the water path has a fault based on the first temperature change trend and the second temperature change trend; An execution unit, used for issuing an abnormal temperature rise warning when it is determined that there is a fault in the water circuit; Among them, the vehicle thermodynamic model is a model constructed through Fourier's law of heat conduction with the actual input power and efficiency distribution of the motor and electronic control when the vehicle is running, the working time, the water pump speed of the thermal management system, and the ambient temperature as constraints.

10. An engineering machine, characterized in that: It comprises an engineering machinery body and the online diagnosis system for high-temperature faults in water circuits of a thermal management system as claimed in claim 9.

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