CN115328234B - Method and device for diagnosing cooling capacity of motor cooling system, processor and vehicle - Google Patents
Method and device for diagnosing cooling capacity of motor cooling system, processor and vehicle Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 281
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000003745 diagnosis Methods 0.000 claims abstract description 124
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
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Abstract
The invention discloses a method and a device for diagnosing cooling capacity of a motor cooling system, a processor and a vehicle. The method comprises the following steps: acquiring working condition information of a vehicle, wherein the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state; under the condition that the working condition information meets the preset condition, controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system; under the condition that the motor cooling system is determined to finish initialization adjustment, testing the cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results; and generating prompt information under the condition that the diagnosis result meets the preset fault condition, wherein the prompt information is used for prompting the fault of the motor cooling system. The invention solves the technical problem of complex diagnosis process of the cooling capacity of the cooling system in the related art.
Description
Technical Field
The invention relates to the technical field of vehicle cooling system diagnosis, in particular to a method and a device for diagnosing cooling capacity of a motor cooling system, a processor and a vehicle.
Background
Today, the shortage of petroleum resources is growing, and the cost and difficulty of the traditional pure internal combustion engine driven vehicles are higher and higher in reducing the fuel consumption facing the stricter fuel consumption regulations; pure electric vehicles can achieve 0 emission, and the electric cost of pure electric vehicles is far lower than that of vehicles driven by internal combustion engines, so that the pure electric vehicles are increasingly favored by consumers in recent years.
For the current electric drive vehicle, most of driving motors are permanent magnet synchronous motors, the permanent magnets are sensitive to temperature, and the permanent magnets can be demagnetized after long-term working in a high-temperature environment, so that the motor performance is reduced, and the energy consumption of the vehicle is increased. Therefore, the electric automobile is commonly provided with a motor and a motor inverter cooling system, heat generated during the operation of the motor and the inverter is taken away through the circulation of cooling liquid, and the heat of the cooling liquid is dissipated through windward of the automobile; the present invention is limited by cost and complexity of a cooling system, and most of motors and inverter cooling systems of an electric automobile are water-cooling systems and are provided with circulating water pumps, meanwhile, in order to calculate the opening of the water pumps, temperatures of all parts of the cooling system, such as motor temperature, motor inverter temperature, cooling liquid temperature at a motor inlet and the like, are required to be collected, so that whether temperature sensors can accurately collect temperatures of all parts is a key that the cooling system can effectively work, and related patents currently diagnose the temperature sensors of the cooling system to judge whether all the temperature sensors can accurately measure temperatures of measuring points. Meanwhile, for the cooling system, the heat of the motor system is finally taken away by circulating water, and the heat is dissipated into the windward direction of the vehicle head through a radiator at the vehicle head, so that the problems of whether the cooling flow is enough and whether the heat conductivity coefficient of each heat exchanger is normal can be summarized as the diagnosis of the cooling capacity of the cooling system, and only if the cooling system maintains enough cooling capacity, the temperature of the relevant part can be reduced to be within the set range when the motor system needs to be cooled.
At present, a method for comparing a model value with a measured value is mostly adopted for judging whether the cooling system works normally for the diagnosis of the cooling capacity of the cooling system, but the method often faces the problem of complex modeling of the cooling system, especially for the application situation that the working point of a cooled object changes severely when the operation working condition is complex.
Therefore, how to perform simple and accurate cooling capacity diagnosis for a vehicle cooling system becomes a key problem in the prior art. In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a method and a device for diagnosing cooling capacity of a motor cooling system, a processor and a vehicle, which are used for at least solving the technical problem of complex diagnosing process of the cooling capacity of the cooling system in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a method of diagnosing cooling capacity of a motor cooling system, the method including the steps of: acquiring working condition information of a vehicle, wherein the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state; under the condition that the working condition information meets the preset condition, controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system; under the condition that the motor cooling system is determined to finish initialization adjustment, testing the cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results; and generating prompt information under the condition that the diagnosis result meets the preset fault condition, wherein the prompt information is used for prompting the fault of the motor cooling system.
Optionally, determining that the working condition information meets the preset condition includes: the running mileage is a preset mileage, the difference value between the temperature of the motor and the ambient temperature is a preset temperature difference value, the running state of the radiator is a normal state, the running state of the electronic water pump is a normal state, the whole vehicle state is a whole vehicle power-down state, the residual electric quantity is in a preset electric quantity range, and the running state of the sensor is a normal state.
Optionally, controlling the vehicle to enter the diagnostic ready state includes turning off an enable signal of the motor, maintaining an enable state of the voltage converter, maintaining an upper high voltage state of the power battery.
Optionally, the initializing the motor cooling system includes: the second interface of the three-way valve is communicated with the third interface, the electronic water pump is controlled to operate at a first preset water pump rotating speed, the second interface is used for being communicated with the water pump, and the third interface is used for being communicated with the water outlet end of the motor; and under the condition that the difference value between the motor temperature and the inverter temperature is smaller than a first preset value or the condition that the electronic water pump runs for a first preset time period at a first preset water pump rotating speed, determining that the motor cooling system finishes initialization adjustment, and recording the motor temperature at the moment as a first initial temperature.
Optionally, the working state includes a first working state, and the cooling capability of the motor cooling system in a plurality of working states is tested to obtain a plurality of diagnosis results, including the following steps: the first interface of the three-way valve is communicated with the second interface, wherein the first interface is used for being communicated with the water outlet end of the radiator; controlling a motor cooling system to operate in a first working state, wherein the first working state comprises controlling an electronic water pump to operate at a second preset water pump rotating speed and controlling a radiator to operate at a first preset radiating power; recording the time required for the motor temperature to drop from the first initial temperature to the first preset temperature as the first cooling time, and recording the motor temperature at the moment as the second initial temperature; acquiring a first preset cooling time length and a first diagnosis model; inputting a first preset cooling time and a first cooling time into a first diagnosis model to obtain a first diagnosis result.
Optionally, the working states include a second working state, the cooling capacity of the motor cooling system in the working states is tested, a plurality of diagnosis results are obtained, and the method further includes: controlling the motor cooling system to operate in a second working state, wherein the second working state comprises controlling the electronic water pump to operate at a third preset water pump rotating speed and controlling the radiator to operate at a second preset radiating power; recording the time required for the temperature of the motor to drop from the second initial temperature to a second preset temperature as second cooling time; acquiring a second preset cooling time length and a second diagnosis model; and inputting a second preset cooling time period and a second cooling time period into a second diagnosis model to obtain a second diagnosis result.
According to still another aspect of the embodiment of the present invention, there is also provided a diagnostic apparatus for a cooling capacity of a motor cooling system, including: the acquisition module is used for acquiring working condition information of the vehicle, and the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state; the control module is used for controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on the motor cooling system under the condition that the working condition information is determined to meet the preset condition; the test module is used for testing the cooling capacity of the motor cooling system in a plurality of working states under the condition that the motor cooling system is determined to finish initialization adjustment, and a plurality of diagnosis results are obtained; the generation module is used for generating prompt information under the condition that the diagnosis result meets the preset fault condition, and the prompt information is used for prompting the fault of the motor cooling system.
According to a further aspect of embodiments of the present invention, there is also provided a computer readable storage medium having a computer program stored therein, wherein the computer program is arranged to perform the above-described method of diagnosing the cooling capacity of a motor cooling system when run.
According to a further aspect of embodiments of the present invention there is also provided a processor for running a program, wherein the program is arranged to perform the method of diagnosing the cooling capacity of the motor cooling system in any of the preceding claims at run-time.
According to yet another aspect of an embodiment of the present invention, there is also provided a vehicle including a motor cooling system that is diagnosed using the method for diagnosing the cooling capacity of the motor cooling system in any one of the foregoing.
In the embodiment of the invention, the working condition information of the vehicle is acquired, and the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state; under the condition that the working condition information meets the preset condition, controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system; under the condition that the motor cooling system is determined to finish initialization adjustment, testing the cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results; and generating prompt information under the condition that the diagnosis result meets the preset fault condition, wherein the prompt information is used for prompting the fault of the motor cooling system. According to the cooling capacity diagnosis method adopted by the embodiment, the cooling diagnosis is carried out under the condition that the vehicle meets the preset condition, potential safety hazards are avoided, the vehicle is controlled to enter a diagnosis preparation state before diagnosis, at the moment, the start and stop of relevant parts in the vehicle can be controlled to avoid energy waste, the motor cooling system is subjected to initialization adjustment, the cooling capacity of the motor cooling system in a plurality of working states can be tested, whether the cooling capacity of the motor system is normal or not is comprehensively judged and determined according to the plurality of diagnosis results, the final diagnosis result is more accurate, the technical effects of improving the simplicity and accuracy of the cooling capacity diagnosis process of the motor cooling system are achieved, and the technical problem that the cooling capacity diagnosis process of the cooling system in related technology is complex is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a block diagram of the hardware architecture of an electronic device of a vehicle according to one embodiment of the application;
FIG. 2 is a flow chart of a method of diagnosing cooling capacity of a motor cooling system according to an alternative embodiment of the present application;
FIG. 3 is a block diagram of a diagnostic device for cooling capacity of a motor cooling system according to one embodiment of the present application;
fig. 4 is a schematic diagram of an electric machine cooling system according to an alternative embodiment of the present application.
Wherein the above figures include the following reference numerals:
1. a heat sink; 2. a three-way valve; 21. a first interface; 22. a second interface; 23. a third interface; 3. an electronic water pump; 4. a coolant temperature sensor; 5. a motor inverter; 6. a motor; 7. an inverter temperature sensor; 8. a motor temperature sensor; 9. an expansion tank.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with one embodiment of the present invention, an embodiment of a method for diagnosing cooling capacity of a motor cooling system is provided, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer executable instructions, and, although a logical sequence is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different order than that illustrated herein.
The method embodiments may be performed in an electronic device or similar computing device in a vehicle that includes a memory and a processor. Taking an example of operation on an electronic device of a vehicle, as shown in fig. 1, the electronic device of the vehicle may include one or more processors 102 (the processors may include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processor (GPU), a Digital Signal Processing (DSP) chip, a Microprocessor (MCU), a programmable logic device (FPGA), a neural Network Processor (NPU), a Tensor Processor (TPU), an Artificial Intelligence (AI) type processor, etc., and a memory 104 for storing data. Optionally, the electronic apparatus of the vehicle may further include a transmission device 106, an input-output device 108, and a display 110 for communication functions. It will be appreciated by those skilled in the art that the configuration shown in fig. 1 is merely illustrative and is not intended to limit the configuration of the electronic device of the vehicle described above. For example, the electronic device of the vehicle may also include more or fewer components than the above structural description, or have a different configuration than the above structural description.
The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to an information processing method in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, implement the information processing method described above. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.
The display 110 may be, for example, a touch screen type Liquid Crystal Display (LCD). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a Graphical User Interface (GUI), and the user may interact with the GUI by touching finger contacts and/or gestures on the touch-sensitive surface, where the man-machine interaction functions optionally include the following interactions: creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving electronic mail, talking interfaces, playing digital video, playing digital music, and/or web browsing, etc., executable instructions for performing the above-described human-machine interaction functions are configured/stored in a computer program product or readable storage medium executable by one or more processors.
In this embodiment, a method for diagnosing cooling capacity of a motor cooling system of an electronic apparatus operating on the vehicle is provided, and fig. 2 is a flowchart of a method for diagnosing cooling capacity of a motor cooling system according to one embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:
step S21, acquiring working condition information of a vehicle, wherein the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state;
step S22, under the condition that the working condition information meets the preset condition, controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system;
step S23, under the condition that the motor cooling system is determined to complete initialization adjustment, testing the cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results;
step S24, under the condition that the diagnosis result meets the preset fault condition, generating prompt information, wherein the prompt information is used for prompting the fault of the motor cooling system.
Specifically, in step S24, the preset fault condition may be that the multiple diagnosis results indicate that the cooling capacity of the motor cooling system in the corresponding working state is reduced, or that the diagnosis result in any one working state indicates that the cooling capacity of the motor cooling system in the working state is reduced, and the preset fault condition may be multiple according to the application requirement of the vehicle and the design requirement of a specific vehicle type. The generated prompt message can be sent in various manners, for example, the user can be reminded of the related fault code through a fault lamp form.
Through the steps, the working condition information of the vehicle is obtained, and the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state; under the condition that the working condition information meets the preset condition, controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system; under the condition that the motor cooling system is determined to finish initialization adjustment, testing the cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results; and generating prompt information under the condition that the diagnosis result meets the preset fault condition, wherein the prompt information is used for prompting the fault of the motor cooling system. According to the cooling capacity diagnosis method adopted by the embodiment, the cooling diagnosis is carried out under the condition that the vehicle meets the preset condition, potential safety hazards are avoided, the vehicle is controlled to enter a diagnosis preparation state before diagnosis, at the moment, the start and stop of relevant parts in the vehicle can be controlled to avoid energy waste, the motor cooling system is subjected to initialization adjustment, the cooling capacity of the motor cooling system in a plurality of working states can be tested, whether the cooling capacity of the motor system is normal or not is comprehensively judged and determined according to the plurality of diagnosis results, the final diagnosis result is more accurate, the technical effects of improving the simplicity and accuracy of the cooling capacity diagnosis process of the motor cooling system are achieved, and the technical problem that the cooling capacity diagnosis process of the cooling system in related technology is complex is solved.
Optionally, in step S22, determining that the working condition information meets the preset condition includes: the running mileage is a preset mileage, the difference value between the temperature of the motor and the ambient temperature is a preset temperature difference value, the running state of the radiator is a normal state, the running state of the electronic water pump is a normal state, the whole vehicle state is a whole vehicle power-down state, the residual electric quantity is in a preset electric quantity range, and the running state of the sensor is a normal state. Therefore, diagnosis can be ensured after the whole vehicle is powered down, the electronic water pump 3 and the radiator 1 can work normally for a long time in the diagnosis process, the 12V storage battery has enough electric quantity to support the completion of diagnosis work, and the DCDC and the power battery are in working states in the diagnosis process, so that the problem that the diagnosis result is inaccurate due to the fact that a certain part cannot normally operate in the diagnosis process and the problem that the residual electric quantity is lower to influence the running of a subsequent vehicle are avoided.
In one exemplary embodiment of the present application, the preset mileage is an integer multiple of 2000km, i.e., the cooling capacity of the motor cooling system is diagnosed once every 2000km the vehicle is running; the preset temperature difference value is any temperature value which is more than 20 ℃; the normal operation state of the radiator means that the radiator has no fault, and in this embodiment, the radiator is a cooling fan; the electronic water pump running state is normal, namely the electronic water pump has no fault; the judging condition that the whole vehicle state is the whole vehicle power-down state is that a driver switches a vehicle key from a key state to a key off state, and at the moment, the fact that the driver has the action of operating the whole vehicle power-down and the vehicle does not have the running requirement can be determined; the residual electric quantity is within the preset electric quantity range, namely that the SOC of the power battery is higher than the lowest SOC threshold value of the engine starting machine by more than 10%; the normal sensor operation state means that all temperature sensors of the motor cooling system have no electrical fault (open circuit to the electricity, open circuit to the ground or open circuit) and reliability fault.
Optionally, in step S22, controlling the vehicle to enter the diagnosis ready state includes turning off the enable signal of the motor 6, maintaining the enable state of the voltage converter, maintaining the upper high voltage state of the power battery.
Specifically, the enable signal to turn off the motor 6, i.e., the motor 6 is no longer responsive to the torque/speed/voltage control request of the overall vehicle controller; the voltage converter can still convert the output voltage of the power battery into preset voltage to supply power to the corresponding components while maintaining the enabling state of the voltage converter; the upper high-voltage state of the power battery is maintained, so that the power battery can still output electric power to the outside. Preferably, the voltage converter is a DCDC voltage converter for converting a high voltage of the power cell to a low voltage of 12V.
Optionally, in step S22, performing an initial adjustment of the motor cooling system includes:
step S221, communicating a second interface 22 of the three-way valve 2 with a third interface 23, and controlling the electronic water pump 3 to operate at a first preset water pump speed, wherein the second interface 22 is used for communicating with the electronic water pump 3, and the third interface 23 is used for communicating with a water outlet end of the motor 6;
in step S222, in the case where it is determined that the difference between the motor temperature and the inverter temperature is smaller than the first preset value, or in the case where the electronic water pump 3 is operated at the first preset water pump rotational speed for the first preset time period, it is determined that the motor cooling system has completed the initialization adjustment, and the motor temperature at this time is recorded as the first initial temperature.
Specifically, in step S222, the first preset value is 2 ℃, the first preset water pump rotation speed is the highest rotation speed of the electronic water pump 3, and the first preset duration is 3 minutes.
Through step S221-step S222, the second port 22 of the three-way valve 2 is communicated with the third port 23, so that the electronic water pump 3 operates at the highest rotation speed for a period of time, so that the cooling liquid circulates between the motor 6 and the motor inverter 5. Because the calorific value of the motor 6 and the calorific value of the motor inverter 5 are different, the motor temperature and the calorific value of the inverter are different, after the whole vehicle is powered down, the motor 6 and the motor inverter 5 do not work any more, and therefore do not continue to generate heat, at the moment, the electronic water pump 3 is operated at the first preset water pump rotating speed, so that cooling liquid circulates between the motor 6 and the motor inverter 5, the motor temperature and the temperature of the inverter are reduced to a more consistent temperature value, when the electronic water pump 3 is operated for the first preset time period or the difference value between the motor temperature and the temperature of the inverter is smaller than the first preset value, namely, the motor temperature and the temperature of the inverter are considered to be stable, because the environmental temperature is not suddenly changed, the follow-up cooling capacity diagnosis is carried out at the fixed environmental temperature and the motor temperature, more interference factors are eliminated, the measurement result is more stable, and the cooling capacity diagnosis result of the cooling system is more accurate.
Optionally, the operation states include a first operation state, and in step S23, the cooling capacity of the motor cooling system in a plurality of operation states is tested to obtain a plurality of diagnosis results, including the steps of:
step S231, communicating the first interface 21 of the three-way valve 2 with the second interface 22, wherein the first interface 21 is used for communicating with the water outlet end of the radiator 1;
step S232, controlling the motor cooling system to operate in a first working state, wherein the first working state comprises controlling the electronic water pump 3 to operate at a second preset water pump rotating speed and controlling the radiator 1 to operate at a first preset heat radiation power;
specifically, in step S232, the second preset water pump rotation speed is 50% of the maximum rotation speed of the electronic water pump 3, the first preset heat dissipation power is 50% of the maximum heat dissipation power of the heat sink 1, and the specific adjustment methods of the heat dissipation powers are different for different heat sinks 1, for example, when the heat sink 1 is a heat dissipation fan, the first preset heat dissipation power may be achieved by setting the rotation speed of the heat dissipation fan to be 50% of the maximum rotation speed.
Step S233, recording the time required for the motor temperature to drop from the first initial temperature to the first preset temperature as a first cooling time, and recording the motor temperature at the moment as a second initial temperature;
Specifically, in step S233, the first preset temperature is related to the ambient temperature, and the calculation method of the first preset temperature is as follows: dlt1= (first initial temperature-ambient temperature) 0.2, wherein dlt1 is a first preset temperature.
Step S234, a first preset cooling time length and a first diagnosis model are obtained;
specifically, in step S234, the first diagnostic model is: a1 = (T1-TS 1)/TS 1×100%, where T1 is a first cooling duration, TS1 is a first preset cooling duration, and A1 is a first diagnosis result.
Step S235, inputting a first preset cooling duration and a first cooling duration into a first diagnosis model to obtain a first diagnosis result.
Specifically, when the first diagnostic result A1 is greater than 15%, it is determined that the cooling capacity of the motor cooling system in the first operating state is reduced.
Through the steps S231-S235, the diagnosis result of the cooling capacity of the motor cooling system in the first working state can be obtained, and the diagnosis result in other working states can be conveniently compared later, so that the diagnosis capacity of the motor cooling system can be judged more accurately.
Optionally, the operation states include a second operation state, and in step S23, testing the cooling capacity of the motor cooling system in a plurality of operation states to obtain a plurality of diagnosis results, further includes:
Step S236, controlling the motor cooling system to operate in a second working state, wherein the second working state comprises controlling the electronic water pump 3 to operate at a third preset water pump rotating speed and controlling the radiator 1 to operate at a second preset heat radiation power;
specifically, in step S236, the third preset water pump rotation speed is the highest rotation speed of the electronic water pump 3, the second preset heat dissipation power is the highest heat dissipation power of the heat sink 1, and the specific adjustment methods of the heat dissipation powers are different for different heat sinks 1, for example, when the heat sink 1 is a heat dissipation fan, the second preset heat dissipation power may be achieved by setting the rotation speed of the heat dissipation fan to the highest rotation speed.
Step S237, recording a time period required for the motor temperature to decrease from the second initial temperature to a second preset temperature as a second cooling time period;
specifically, in step S237, the second preset temperature is related to the ambient temperature, and the calculation method of the second preset temperature is as follows: dlt2= (second initial temperature-ambient temperature) 0.3, wherein dlt2 is a second preset temperature.
Step S238, a second preset cooling time length and a second diagnosis model are obtained;
specifically, in step S238, the second diagnostic model is a2= (T2-TS 2)/TS 2×100%, where TS2 is a second preset cooling duration, T2 is a second cooling duration, and A2 is a second diagnostic result.
Step S239, inputting a second preset cooling duration and a second cooling duration into a second diagnosis model to obtain a second diagnosis result.
Specifically, when the second diagnostic result A2 is greater than 10%, it is determined that the cooling capacity of the motor cooling system in the second operating state is reduced.
Through the steps S236-S239, the diagnosis result of the cooling capacity of the motor cooling system in the second working state can be obtained, and the diagnosis result in other working states can be conveniently compared later, so that the diagnosis capacity of the motor cooling system can be judged more accurately.
In combination with the above embodiment, in step S24, in the case where it is determined that the diagnosis result meets the preset fault condition, the preset fault condition in the generated prompt message may be: the first diagnosis result A1 is greater than 15% and the second diagnosis result A2 is greater than 10%, that is, when it is determined that the cooling capacity of the motor cooling system is reduced in both the first operating state and the second operating state, it is determined that the cooling capacity of the motor cooling system is reduced.
In step S231-step S239, the setting method of the first preset cooling duration and the second preset cooling duration is as follows: in the environmental simulation cabin, in a temperature range in which the vehicle is permitted to use (for the vehicle in this embodiment, the use temperature thereof is-40 ℃ to 50 ℃), the temperature of the environmental simulation cabin is set to one point every 5 ℃ from-40 ℃ to 50 ℃; at each ambient temperature, the motor coolant temperature is set by the additional coolant temperature adjusting means sequentially to a temperature 20 ℃ higher than the ambient temperature up to the maximum temperature at which the motor is allowed to operate (for this embodiment, the maximum temperature at which the motor is allowed to operate is 70 ℃), one point every 5 ℃; after the motor temperature and the motor inverter temperature are stable, executing the foregoing steps S231-S233, obtaining the time required for lowering the motor temperature by a first preset temperature in the cooling system half-on state (i.e., the first working state in this embodiment) at the current ambient temperature and the current motor initial temperature, as the TS1 value in the ambient temperature and the motor initial temperature, then raising the motor temperature again to the motor initial temperature in the test in the cooling system half-on state, executing the foregoing steps S236-S237, obtaining the time required for lowering the motor temperature by a second preset temperature in the cooling system full-on state (i.e., the second working state) at the current ambient temperature and the current motor initial temperature, as the TS2 value in the ambient temperature and the motor initial temperature; continuously changing the environment temperature and the initial temperature of the motor, wherein the environment temperature is changed by 5 ℃ each time, and the initial temperature of the motor is changed by 5 ℃ each time, so that the cooling time TS1 in the half-open state of the cooling system and the cooling time TS2 in the full-open state of the cooling system are obtained under different environment temperatures and different initial temperatures of the motor; the finally determined TS1 and TS2 can be displayed in a two-dimensional table form, and the input of the table is the ambient temperature and the initial temperature of the motor respectively.
In one exemplary embodiment of the application, after the cooling capacity diagnostic is completed, the vehicle controller turns off the DCDC enable, turns off the power cell relay, turns off the vehicle under high voltage, and then transitions to a sleep state.
Fig. 4 is a schematic diagram of an electric machine cooling system according to an alternative embodiment of the present application. As shown in fig. 4, the motor cooling system comprises a radiator 1, a three-way valve 2, an electronic water pump 3, a motor inverter 5 and a motor 6 which are sequentially arranged, a cooling liquid temperature sensor 4 is arranged on a cooling pipeline between the electronic water pump 3 and the motor inverter 5, an inverter temperature sensor 7 is arranged on the motor inverter 5, a motor temperature sensor 8 is arranged on the motor 6, and a water outlet end of an expansion water tank 9 is connected with an inlet end of the electronic water pump 3. The three-way valve 2 comprises a first interface 21, a second interface 22 and a third interface 23, wherein the first interface 21 is connected with the outlet end of the radiator 1, the second interface 22 is connected with the inlet end of the electronic water pump 3, and the third interface 23 is connected with the water outlet pipeline of the motor 6 and the inlet end of the radiator 1.
From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present application.
In this embodiment, a device for diagnosing the cooling capacity of the cooling system of the motor is further provided, and this device is used to implement the foregoing embodiments and preferred embodiments, and will not be described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
Fig. 3 is a block diagram of a device for diagnosing cooling capacity of a motor cooling system according to an embodiment of the present invention, and as shown in fig. 3, the device includes an obtaining module 30, a control module 32, a testing module 34, and a generating module 36, where the obtaining module 30 is configured to obtain operating condition information of a vehicle, and the operating condition information includes at least: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state; the control module 32 is used for controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on the motor cooling system under the condition that the working condition information meets the preset condition; the test module 34 is configured to test a cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results when it is determined that the motor cooling system has completed the initialization adjustment; the generating module 36 is configured to generate a prompt message for prompting a motor cooling system failure if it is determined that the diagnosis result meets the preset failure condition.
Through the device, the working condition information of the vehicle is acquired, and the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state; under the condition that the working condition information meets the preset condition, controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system; under the condition that the motor cooling system is determined to finish initialization adjustment, testing the cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results; and generating prompt information under the condition that the diagnosis result meets the preset fault condition, wherein the prompt information is used for prompting the fault of the motor cooling system. According to the cooling capacity diagnosis method adopted by the embodiment, the cooling diagnosis is carried out under the condition that the vehicle meets the preset condition, potential safety hazards are avoided, the vehicle is controlled to enter a diagnosis preparation state before diagnosis, at the moment, the start and stop of relevant parts in the vehicle can be controlled to avoid energy waste, the motor cooling system is subjected to initialization adjustment, the cooling capacity of the motor cooling system in a plurality of working states can be tested, whether the cooling capacity of the motor system is normal or not is comprehensively judged and determined according to the plurality of diagnosis results, the final diagnosis result is more accurate, the technical effects of improving the simplicity and accuracy of the cooling capacity diagnosis process of the motor cooling system are achieved, and the technical problem that the cooling capacity diagnosis process of the cooling system in related technology is complex is solved.
It should be noted that each of the above modules may be implemented by software or hardware, and for the latter, it may be implemented by, but not limited to: the modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.
An embodiment of the invention also provides a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run.
Alternatively, in the present embodiment, the above-described storage medium may be configured to store a computer program for performing the steps of:
step S1, acquiring working condition information of a vehicle, wherein the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state;
step S2, under the condition that the working condition information meets the preset condition, controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system;
step S3, under the condition that the motor cooling system is determined to finish initialization adjustment, testing the cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results;
And S4, generating prompt information for prompting the motor cooling system to fail under the condition that the diagnosis result meets the preset failure condition.
Alternatively, in the present embodiment, the storage medium may include, but is not limited to: a usb disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing a computer program.
Embodiments of the invention also provide a processor arranged to run a computer program to perform the steps of any of the method embodiments described above.
Alternatively, in the present embodiment, the above-described processor may be configured to execute the following steps by a computer program:
step S1, acquiring working condition information of a vehicle, wherein the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state;
step S2, under the condition that the working condition information meets the preset condition, controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system;
Step S3, under the condition that the motor cooling system is determined to finish initialization adjustment, testing the cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results;
and S4, generating prompt information for prompting the motor cooling system to fail under the condition that the diagnosis result meets the preset failure condition.
Embodiments of the present application also provide a vehicle including a motor cooling system that is diagnosed using the method of diagnosing cooling capacity of the motor cooling system in any of the foregoing.
Alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments and optional implementations, and this embodiment is not described herein.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A method of diagnosing cooling capacity of a motor cooling system, the method comprising the steps of:
acquiring working condition information of a vehicle, wherein the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state;
under the condition that the working condition information meets the preset condition, controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system;
under the condition that the motor cooling system is determined to finish the initialization adjustment, testing the cooling capacity of the motor cooling system in a plurality of working states to obtain a plurality of diagnosis results;
generating prompt information under the condition that the diagnosis result meets the preset fault condition, wherein the prompt information is used for prompting the fault of a motor cooling system;
Controlling the vehicle to enter a diagnostic ready state includes turning off an enable signal of a motor (6), maintaining an enable state of a voltage converter, maintaining an upper high voltage state of a power battery;
initializing the motor cooling system includes:
the second interface (22) of the three-way valve (2) is communicated with the third interface (23) to control the electronic water pump (3) to run at a first preset water pump rotating speed, wherein the second interface (22) is used for being communicated with the electronic water pump (3), and the third interface (23) is used for being communicated with the water outlet end of the motor (6);
under the condition that the difference value between the motor temperature and the inverter temperature is smaller than a first preset value or the condition that the electronic water pump (3) operates at the first preset water pump rotating speed for a first preset time period, determining that the motor cooling system finishes the initialization adjustment, and recording the motor temperature at the moment as a first initial temperature;
the working state comprises a first working state, the cooling capacity of the motor cooling system in a plurality of working states is tested, a plurality of diagnosis results are obtained, and the method comprises the following steps:
a first interface (21) of the three-way valve (2) is communicated with the second interface (22), wherein the first interface (21) is used for being communicated with a water outlet end of the radiator (1);
Controlling the motor cooling system to operate in the first working state, wherein the first working state comprises controlling the electronic water pump (3) to operate at a second preset water pump rotating speed and controlling the radiator (1) to operate at a first preset heat radiation power;
recording the time required by the motor temperature to drop from the first initial temperature to a first preset temperature as a first cooling time, and recording the motor temperature at the moment as a second initial temperature, wherein the calculation method of the first preset temperature comprises the following steps: dlt1= (first initial temperature-ambient temperature) 0.2, wherein dlt1 is a first preset temperature;
acquiring a first preset cooling time length and a first diagnosis model;
inputting the first preset cooling time length and the first cooling time length into the first diagnosis model to obtain a first diagnosis result, wherein the first diagnosis model is as follows: a1 = (T1-TS 1)/TS 1×100%, where T1 is a first cooling duration, TS1 is a first preset cooling duration, and A1 is a first diagnosis result;
the working states comprise a second working state, the cooling capacity of the motor cooling system in a plurality of working states is tested, a plurality of diagnosis results are obtained, and the motor cooling system further comprises:
controlling the motor cooling system to operate in the second working state, wherein the second working state comprises controlling the electronic water pump (3) to operate at a third preset water pump rotating speed and controlling the radiator (1) to operate at a second preset heat radiation power;
Recording the time required for the motor temperature to drop from the second initial temperature to a second preset temperature as a second cooling time, wherein the calculation method of the second preset temperature is as follows: dlt2= (second initial temperature-ambient temperature) 0.3, wherein dlt2 is a second preset temperature;
acquiring a second preset cooling time length and a second diagnosis model;
inputting the second preset cooling duration and the second cooling duration into the second diagnosis model to obtain a second diagnosis result, wherein the second diagnosis model is a2= (T2-TS 2)/TS 2 x 100%, TS2 is the second preset cooling duration, T2 is the second cooling duration, and A2 is the second diagnosis result.
2. The method of claim 1, wherein determining that the operating condition information satisfies a preset condition comprises:
the running mileage is preset mileage, the difference value between the temperature of the motor and the ambient temperature is a preset temperature difference value, the running state of the radiator is a normal state, the running state of the electronic water pump is a normal state, the whole vehicle state is a whole vehicle power-down state, the residual electric quantity is in a preset electric quantity range, and the running state of the sensor is a normal state.
3. A diagnostic device for cooling capacity of a motor cooling system, said device comprising:
The acquisition module is used for acquiring working condition information of the vehicle, and the working condition information at least comprises: vehicle operation mileage, motor temperature, inverter temperature, ambient temperature, power battery residual capacity, electronic water pump operation state, radiator operation state, whole vehicle state, sensor operation state;
the control module is used for controlling the vehicle to enter a diagnosis preparation state and carrying out initialization adjustment on a motor cooling system under the condition that the working condition information is determined to meet the preset condition;
the test module is used for testing the cooling capacity of the motor cooling system in a plurality of working states under the condition that the motor cooling system is determined to finish the initialization adjustment, so as to obtain a plurality of diagnosis results;
the generation module is used for generating prompt information under the condition that the diagnosis result meets the preset fault condition, and the prompt information is used for prompting the fault of the motor cooling system;
controlling the vehicle to enter a diagnostic ready state includes turning off an enable signal of a motor (6), maintaining an enable state of a voltage converter, maintaining an upper high voltage state of a power battery;
Initializing the motor cooling system includes:
the second interface (22) of the three-way valve (2) is communicated with the third interface (23) to control the electronic water pump (3) to run at a first preset water pump rotating speed, wherein the second interface (22) is used for being communicated with the electronic water pump (3), and the third interface (23) is used for being communicated with the water outlet end of the motor (6);
under the condition that the difference value between the motor temperature and the inverter temperature is smaller than a first preset value or the condition that the electronic water pump (3) operates at the first preset water pump rotating speed for a first preset time period, determining that the motor cooling system finishes the initialization adjustment, and recording the motor temperature at the moment as a first initial temperature;
the working state comprises a first working state, the cooling capacity of the motor cooling system in a plurality of working states is tested, a plurality of diagnosis results are obtained, and the method comprises the following steps:
a first interface (21) of the three-way valve (2) is communicated with the second interface (22), wherein the first interface (21) is used for being communicated with a water outlet end of the radiator (1);
controlling the motor cooling system to operate in the first working state, wherein the first working state comprises controlling the electronic water pump (3) to operate at a second preset water pump rotating speed and controlling the radiator (1) to operate at a first preset heat radiation power;
Recording the time required by the motor temperature to drop from the first initial temperature to a first preset temperature as a first cooling time, and recording the motor temperature at the moment as a second initial temperature, wherein the calculation method of the first preset temperature comprises the following steps: dlt1= (first initial temperature-ambient temperature) 0.2, wherein dlt1 is a first preset temperature;
acquiring a first preset cooling time length and a first diagnosis model;
inputting the first preset cooling time period and the first cooling time period into the first diagnosis model to obtain
A first diagnostic result, the first diagnostic model being: a1 = (T1-TS 1)/TS 1×100%, where T1 is a first cooling duration, TS1 is a first preset cooling duration, and A1 is a first diagnosis result;
the working states comprise a second working state, the cooling capacity of the motor cooling system in a plurality of working states is tested, a plurality of diagnosis results are obtained, and the motor cooling system further comprises:
controlling the motor cooling system to operate in the second working state, wherein the second working state comprises controlling the electronic water pump (3) to operate at a third preset water pump rotating speed and controlling the radiator (1) to operate at a second preset heat radiation power;
recording the time required for the motor temperature to drop from the second initial temperature to a second preset temperature as a second cooling time, wherein the calculation method of the second preset temperature is as follows: dlt2= (second initial temperature-ambient temperature) 0.3, wherein dlt2 is a second preset temperature;
Acquiring a second preset cooling time length and a second diagnosis model;
inputting the second preset cooling duration and the second cooling duration into the second diagnosis model to obtain a second diagnosis result, wherein the second diagnosis model is a2= (T2-TS 2)/TS 2 x 100%, TS2 is the second preset cooling duration, T2 is the second cooling duration, and A2 is the second diagnosis result.
4. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the computer-readable storage medium is controlled when the program is run, and wherein the apparatus performs the method for diagnosing the cooling capacity of the motor cooling system according to any one of claims 1 to 2.
5. A processor for running a program, wherein the program runs to perform the method of diagnosing the cooling capacity of the motor cooling system according to any one of claims 1 to 2.
6. A vehicle comprising a motor cooling system, characterized in that the motor cooling system is diagnosed by a method for diagnosing the cooling capacity of the motor cooling system according to any one of claims 1 to 2.
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