CN117977886A

CN117977886A - Motor water inlet detection method and device, storage medium and whole vehicle controller

Info

Publication number: CN117977886A
Application number: CN202410028760.7A
Authority: CN
Inventors: 汪汉新; 杨小娟; 刘淼; 黄浩涛
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2024-01-08
Filing date: 2024-01-08
Publication date: 2024-05-03

Abstract

The invention provides a motor water inlet detection method, a motor water inlet detection device, a storage medium and a whole vehicle controller, wherein the motor water inlet detection method comprises the following steps: the top of the stator of the motor is provided with a first temperature sensor, and the bottom of the stator of the motor is provided with a second temperature sensor; the motor water inlet detection method comprises the following steps: acquiring a first temperature value acquired by the first temperature sensor and a second temperature value acquired by the second temperature sensor; judging whether the temperature difference value of the first temperature value and the second temperature value is larger than a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition; and if the temperature difference value is larger than the preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition, determining that the motor is in water. The scheme provided by the invention can achieve the purpose of water inlet alarm of the motor without additional circuits and equipment, and improves the reliability of the motor.

Description

Motor water inlet detection method and device, storage medium and whole vehicle controller

Technical Field

The invention relates to the field of control, in particular to a motor water inflow detection method, a motor water inflow detection device, a storage medium and a vehicle controller.

Background

The motor is widely used as a motor for providing driving force of a new energy vehicle, however, in the use process of the motor, due to the limitations of a motor assembly process and the like, the sealing of the motor cannot be completely free of water, ground water can be directly thrown to a vehicle chassis along with the rotation of wheels, the position opposite to water throwing is the motor shaft extension end, the water can overflow the motor shaft extension end, and enters the motor from a gap between a bearing outer cover and a rotating shaft, so that the insulation resistance value of the motor is reduced to cause faults, and irrecoverable loss is brought to the motor.

Disclosure of Invention

The invention aims to overcome the defects of the related art and provides a motor water inflow detection method, a motor water inflow detection device, a storage medium and a whole vehicle controller, so as to solve the problem of water inflow of an electric vehicle motor in the related art.

The invention provides a motor water inflow detection method, wherein a first temperature sensor is arranged at the top of a stator of a motor, and a second temperature sensor is arranged at the bottom of the stator of the motor; the motor water inlet detection method comprises the following steps: acquiring a first temperature value acquired by the first temperature sensor and a second temperature value acquired by the second temperature sensor; judging whether the temperature difference value of the first temperature value and the second temperature value is larger than a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition; and if the temperature difference value is larger than the preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition, determining that the motor is in water.

Optionally, the method further comprises: respectively acquiring the maximum temperature difference value of a first temperature value acquired by the first temperature sensor and a second temperature value acquired by the second temperature sensor under each operation condition when the motor is not fed with water; and respectively determining a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under each operation condition according to the obtained maximum temperature difference value of the first temperature value and the second temperature value under each operation condition when the motor is not in water.

Optionally, the method further comprises: and if the motor is determined to be in water, a corresponding alarm signal is sent.

Optionally, the method further comprises: checking whether IP protection of the motor fails; if the IP protection is checked to be invalid, a prompt message is sent out to prompt a user to repair or replace the motor; and if the IP protection is checked to be not invalid, performing drainage operation on the motor.

Optionally, the first temperature sensor and the second temperature sensor are NTC thermistors.

The invention further provides a water inlet detection device of the motor, wherein the top of the stator of the motor is provided with a first temperature sensor, and the bottom of the stator of the motor is provided with a second temperature sensor; the motor detection device that intakes includes: the first acquisition unit is used for acquiring a first temperature value acquired by the first temperature sensor and a second temperature value acquired by the second temperature sensor; the judging unit is used for judging whether the temperature difference value between the first temperature value and the second temperature value obtained by the first obtaining unit is larger than a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition; and the first determining unit is used for determining that the motor is fed if the judging unit judges that the temperature difference value is larger than a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition.

Optionally, the method further comprises: the second acquisition unit is used for respectively acquiring the maximum temperature difference value between the first temperature value acquired by the first temperature sensor and the second temperature value acquired by the second temperature sensor under each operation condition when the motor does not feed water; the second determining unit is used for determining preset temperature difference thresholds of the first temperature sensor and the second temperature sensor under each operation condition according to the maximum temperature difference value of the first temperature value and the second temperature value under each operation condition when the motor does not feed water, which is acquired by the second acquiring unit.

Optionally, the method further comprises: and the alarm unit is used for sending out a corresponding alarm signal if the first determination unit determines that the motor is water-feeding.

Optionally, the method further comprises: the checking unit is used for checking whether the IP protection of the motor fails; the prompting unit is used for sending prompting information to prompt a user to repair or replace the motor if the checking unit checks that the IP protection fails; and the operation unit is used for performing drainage operation on the motor if the checking unit checks that the IP protection is not invalid.

In a further aspect the invention provides a storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.

In a further aspect, the present invention provides a vehicle controller for an electric vehicle, comprising a processor, a memory and a computer program stored on the memory and operable on the processor, the processor implementing the steps of any of the methods described above when executing the program.

The invention further provides a whole vehicle controller of the electric vehicle, which comprises any one of the motor water inlet detection devices.

According to the technical scheme of the invention, the water inlet condition of the motor is determined according to the temperature difference of temperature signals detected by the temperature sensors buried at the top and the bottom of the motor stator, no additional circuit or equipment is needed, the purpose of water inlet alarm of the motor is achieved, and the reliability of the motor is improved.

According to the technical scheme of the invention, whether the motor is in water is detected on line, the target temperature difference of the motor is obtained, and then whether the motor is in water is judged according to the obtained motor temperature difference, so that the aim of alarming the motor in water is fulfilled. Based on the two temperature sensors (such as NTC thermistors) arranged at the end parts of the stator winding, the temperature difference is used for judging whether the motor is water-filled, and no additional equipment or circuit is needed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

FIG. 1 is a schematic diagram of a method for detecting water inflow of a motor according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a temperature sensor mounting location according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of another embodiment of a method for detecting water inlet of a motor according to the present invention;

FIG. 4 is a schematic diagram of a method for detecting water inlet of a motor according to an embodiment of the present invention;

FIG. 5 is a block diagram of an embodiment of a motor inlet water detection device provided by the invention;

Fig. 6 is a block diagram of another embodiment of the motor water inlet detection device provided by the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

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.

The motor for new energy vehicles is continuously increased in power density and smaller in size, electromagnetic load and thermal load are also continuously increased, and the internal temperature rise of the motor is often too high when the motor works due to the fact that the too high thermal load, the narrow mounting position, the poor cooling environment and the like. For measuring the temperature of the stator of the motor at any time, two or more temperature sensors (such as NTC thermistors) are arranged at the end parts of the stator winding to prevent the motor from being overheated, and the temperature sensors are usually arranged at the end parts of the stator winding, wherein the number of the temperature sensors is 2-3, because the temperature rise of the end parts of the stator winding is highest.

The invention provides a motor water inlet detection method. The invention can be implemented in a complete vehicle controller VCU of an electric vehicle, such as a new energy electric vehicle. The top of the stator of the motor is provided with a first temperature sensor, and the bottom of the stator of the motor is provided with a second temperature sensor. Preferably, the first and second temperature sensors are NTC thermistors. For example, the first temperature sensor is a thermistor R1, and the second temperature sensor is a thermistor R2.

The first temperature sensor (for example, a thermistor R1) is buried at the top of the stator (namely, the thermistor is placed in an end winding of the stator, the end winding wraps the thermistor, the thermistor does not need to be installed at the top, and the position close to the top of the stator can be selected as much as possible according to the installation condition of the motor), namely, the position far away from the ground when the stator is installed on a vehicle; the second temperature sensor (for example, a thermistor R2) is buried at the bottommost part of the stator, namely, the position closest to the ground when the stator is mounted on a vehicle, so that water inflow detection is facilitated.

Fig. 2 is a schematic view of a temperature sensor mounting location according to an embodiment of the present invention. Fig. 2 is a schematic diagram of an end face of a stator of a motor, wherein 1 is a stator core, 2 is a stator winding end, 3 is a stator tooth portion, 4 is a first temperature sensor (for example, a thermistor R1) buried at the top of the stator, 5 is a second temperature sensor (for example, a second thermistor R2) buried at the bottom of the stator, 6 is a three-phase lead-out end, the three-phase line and two NTC thermistors lead out of the motor at the top of the stator, are connected with a control end, and send a motor signal to the control end.

After the motor is filled with water, the water entering the motor can lead to the temperature reduction detected by the second sensor at the bottom of the stator due to the cooling effect of the water, and when the temperature difference of the temperatures detected by the two sensors is larger than a preset temperature threshold value, the motor can give a warning rapidly and transmit information to a control end, and the control end makes corresponding measures to reduce the damage of the motor. The first temperature sensor and the second temperature sensor are preferably NTC thermistors, the NTC thermistors are negative temperature coefficient temperature sensors, the resistance value is reduced along with the temperature rise, and the measured point temperature can be obtained through conversion of the resistance value.

Fig. 1 is a schematic diagram of a method of an embodiment of a method for detecting water inflow of a motor according to the present invention.

As shown in fig. 1, the method for detecting water inflow of a motor according to an embodiment of the present invention at least includes step S110, step S120, and step S130.

Step S110, acquiring a first temperature value acquired by the first temperature sensor and a second temperature value acquired by the second temperature sensor.

The first temperature sensor and the second temperature sensor are respectively an NTC thermistor R1 and an NTC thermistor R2, the NTC thermistor is a negative temperature coefficient temperature sensor, the resistance value is reduced along with the temperature rise, and the measured point temperature can be obtained through conversion of the resistance value. For example, temperature signals T1 and T2 of the thermistor R1 and the thermistor R2 may be acquired. The temperature difference DeltaT= |T1-T2| between T1 and T2 is calculated. The invention can be implemented in a vehicle controller VCU of an electric vehicle, temperature signals T1 and T2 of NTC thermistors R1 and R2 can be acquired in real time through a driving motor controller MCU, the MCU transmits the acquired temperature signals T1 and T2 to the vehicle controller VCU, and the VCU calculates a temperature difference DeltaT= |T1-T2| between T1 and T2.

Step S120 is to determine whether the temperature difference between the first temperature value and the second temperature value is greater than a preset temperature difference threshold between the first temperature sensor and the second temperature sensor under the current operation condition.

And step S130, if the temperature difference value is larger than the preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition, determining that the motor is in water.

Specifically, under different operation conditions, the preset temperature difference threshold values of the first temperature sensor and the second temperature sensor are different, and the preset temperature difference threshold values of the first temperature sensor and the second temperature sensor under the current operation condition are determined according to the current operation condition. The preset temperature difference threshold values of the first temperature sensor and the second temperature sensor under different operation conditions can be preset in the motor controller MCU.

For example, under the current operation condition, if the preset temperature difference threshold is DeltaTw, judging whether DeltaT is larger than DeltaTw, if DeltaT is less than or equal to DeltaTw, the operation condition of the motor is normal, and the whole vehicle controller does not process. When DeltaT > DeltaTw, the motor is judged to be fed.

Optionally, the method may further include: and if the motor is determined to be in water, a corresponding alarm signal is sent.

Specifically, if it is determined that the motor is water-in, an alarm signal can be sent out, for example, the vehicle control unit VCU sends out the alarm signal, and the alarm signal can be a sound prompt or a text prompt, for example, when the vehicle owner perceives the alarm, the vehicle owner can stop in time to detect and repair the motor or drain the motor, so that the service life of the motor is prolonged.

Optionally, the method may further include: checking whether IP protection of the motor fails; if the IP protection is checked to be invalid, a prompt message is sent out to prompt a user to repair or replace the motor; and if the IP protection is checked to be not invalid, performing drainage operation on the motor.

Fig. 3 is a schematic diagram of a method of another embodiment of a motor water inlet detection method provided by the invention.

As shown in fig. 3, according to another embodiment of the present invention, based on the above embodiment, the method for detecting water inflow of a motor further includes step S102 and step S104.

Step S102, respectively obtaining the maximum temperature difference value between the first temperature value collected by the first temperature sensor and the second temperature value collected by the second temperature sensor under each operation condition when the motor is not in water.

Step S104, respectively determining a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under each operation condition according to the obtained maximum temperature difference value of the first temperature value and the second temperature value under each operation condition when the motor is not in water.

The method comprises the steps of respectively obtaining the maximum temperature difference value of the first temperature value and the second temperature value under each operation condition of a motor under the condition of no water inlet, and taking the sum of the maximum temperature difference value of the first temperature value and the second temperature value under each operation condition and a preset error compensation value as a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under each operation condition.

For example, the maximum temperature difference between two NTCs of the motor under different operation conditions of the motor under normal condition (no water inlet) is obtained, in order to ensure accurate data, each condition may be collected multiple times when the motor is calibrated, so as to obtain the maximum temperature difference Δtmax under the condition, and Δtmax+a is taken as a temperature difference warning value Δtw (i.e. a preset temperature difference threshold) under the condition, where a is a preset error compensation value, for example, 5k, and k is a unit of kelvin.

In order to clearly illustrate the technical scheme of the invention, the execution flow of the motor water inlet detection method provided by the invention is described in the following by a specific embodiment.

Fig. 4 is a schematic diagram of a method for detecting water inflow of a motor according to an embodiment of the present invention. As shown in fig. 4, step 1: the method comprises the steps of obtaining the maximum temperature difference of two thermistors NTC of a motor under the normal condition of the motor and under different operation working conditions, and acquiring multiple times of each working condition when the motor is calibrated in order to ensure accurate data, wherein the maximum temperature difference delta Tmax+5k under the acquired working condition is used as a temperature difference warning value delta Tw (namely a preset temperature difference threshold value) under the working condition.

Step 2: the temperature difference warning value delta Tw of each working condition is preset in the driving motor controller MCU.

Step 3: the driving motor controller MCU collects temperature signals T1 and T2 of the first NTC thermistor R1 and the second NTC thermistor R2 in real time.

Step 4: the MCU transmits the acquired data to the whole vehicle controller VCU, and the whole vehicle controller VCU calculates the temperature difference DeltaT= |T1-T2| between T1 and T2.

Step 5: the vehicle controller VCU judges whether DeltaT is larger than a temperature difference warning value DeltaTw under the current working condition.

Step 6: when the delta T is less than or equal to delta Tw, the motor is in normal running state, and the controller does not process. When the delta T delta Tw is judged to be that the motor is water-in, the driving motor controller MCU transmits a water-in signal to the whole vehicle controller VCU through the CAN bus, the whole vehicle controller sends out an alarm signal, and when a vehicle owner sees the alarm display, the vehicle owner CAN stop in time to check and repair the motor or drain water to the motor, so that the service life of the motor is prolonged.

The invention also provides a motor water inlet detection device. The invention can be implemented in a complete vehicle controller VCU of an electric vehicle, such as a new energy electric vehicle. The top of the stator of the motor is provided with a first temperature sensor, and the bottom of the stator of the motor is provided with a second temperature sensor. Preferably, the first and second temperature sensors are NTC thermistors. For example, the first temperature sensor is a thermistor R1, and the second temperature sensor is a thermistor R2.

The first temperature sensor (for example, the thermistor R1) is buried at the top of the stator (namely, the thermistor is placed in an end winding of the stator, the end winding wraps the thermistor, the thermistor is not required to be mounted at the top, the position close to the top of the stator can be selected as far as possible according to motor mounting conditions), namely, when the stator is mounted on a vehicle, the position far away from the ground, and the second temperature sensor (for example, the thermistor R2) is buried at the bottommost part of the stator, namely, when the stator is mounted on the vehicle, the position closest to the ground, so that water inflow detection is facilitated.

Fig. 5 is a block diagram of an embodiment of a motor water inlet detection device provided by the invention. As shown in fig. 5, the motor water inflow detection device 100 includes a first acquisition unit 110, a judgment unit 120, and a first determination unit 130.

The first obtaining unit 110 is configured to obtain a first temperature value collected by the first temperature sensor and a second temperature value collected by the second temperature sensor.

The judging unit 120 is configured to judge whether a temperature difference between the first temperature value and the second temperature value obtained by the first obtaining unit is greater than a preset temperature difference threshold between the first temperature sensor and the second temperature sensor under a current operating condition.

The first determining unit 130 is configured to determine that the motor is running water if the determining unit determines that the temperature difference is greater than a preset temperature difference threshold between the first temperature sensor and the second temperature sensor under the current running condition.

Optionally, the apparatus 100 may further include an alarm unit (not shown) for sending a corresponding alarm signal if the first determining unit determines that the motor is water-feeding. Specifically, if it is determined that the motor is water-in, an alarm signal can be sent out, for example, the vehicle control unit VCU sends out the alarm signal, and the alarm signal can be a sound prompt or a text prompt, for example, when the vehicle owner perceives the alarm, the vehicle owner can stop in time to detect and repair the motor or drain the motor, so that the service life of the motor is prolonged.

Optionally, the apparatus 100 may further include an inspection unit, a prompt unit, and an operation unit (not shown).

The checking unit is used for checking whether the IP protection of the motor fails; the prompting unit is used for sending prompting information to prompt a user to repair or replace the motor if the checking unit checks that the IP protection fails; and the operation unit is used for performing drainage operation on the motor if the checking unit checks that the IP protection is not invalid.

Fig. 6 is a block diagram of another embodiment of the motor water inlet detection device provided by the invention. As shown in fig. 6, the motor water inflow detection device 100 further includes a second acquisition unit 102 and a second determination unit 104.

The second obtaining unit 102 is configured to obtain a maximum temperature difference between the first temperature value collected by the first temperature sensor and the second temperature value collected by the second temperature sensor under each operation condition when the motor is not running.

And a second determining unit 104, configured to determine a preset temperature difference threshold of the first temperature sensor and the second temperature sensor under each operation condition according to a maximum temperature difference value between the first temperature value and the second temperature value under each operation condition when the motor is not fed with water, which is acquired by the second acquiring unit 102.

The invention also provides a storage medium corresponding to the motor water inlet detection method, and a computer program is stored on the storage medium, and the program realizes the steps of any one of the methods when being executed by a processor.

The invention also provides a whole vehicle controller of the electric vehicle corresponding to the motor water inflow detection method, which comprises a processor, a memory and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of any one of the methods when executing the program.

The invention also provides a whole vehicle controller of the electric vehicle corresponding to the motor water inflow detection device, which comprises any one of the motor water inflow detection devices.

According to the scheme provided by the invention, the water inlet condition of the motor is determined according to the temperature difference of the temperature signals detected by the temperature sensors embedded at the top and the bottom of the motor stator, no additional circuit or equipment is needed, the purpose of water inlet alarm of the motor is achieved, and the reliability of the motor is improved.

According to the scheme provided by the invention, whether the motor is in water is detected on line, the target temperature difference of the motor is obtained, and then whether the motor is in water is judged according to the obtained motor temperature difference, so that the aim of alarming when the motor is in water is achieved. Based on the two temperature sensors (such as NTC thermistors) arranged at the end parts of the stator winding, the temperature difference is used for judging whether the motor is water-filled, and no additional equipment or circuit is needed.

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit.

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 components may or may not be physically separate, and components as control devices may or may not be physical units, may be located in one place, or may be distributed over 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.

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 in essence or a part contributing to the related art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several 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 usb 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 above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The motor water inflow detection method is characterized in that a first temperature sensor is arranged at the top of a stator of the motor, and a second temperature sensor is arranged at the bottom of the stator of the motor;

the motor water inlet detection method comprises the following steps: acquiring a first temperature value acquired by the first temperature sensor and a second temperature value acquired by the second temperature sensor;

Judging whether the temperature difference value of the first temperature value and the second temperature value is larger than a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition;

And if the temperature difference value is larger than the preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition, determining that the motor is in water.

2. The method as recited in claim 1, further comprising:

Respectively acquiring the maximum temperature difference value of a first temperature value acquired by the first temperature sensor and a second temperature value acquired by the second temperature sensor under each operation condition when the motor is not fed with water;

And respectively determining a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under each operation condition according to the obtained maximum temperature difference value of the first temperature value and the second temperature value under each operation condition when the motor is not in water.

3. The method according to claim 1 or 2, further comprising: and if the motor is determined to be in water, a corresponding alarm signal is sent.

4. A method according to any one of claims 1-3, further comprising:

checking whether IP protection of the motor fails;

if the IP protection is checked to be invalid, a prompt message is sent out to prompt a user to repair or replace the motor;

And if the IP protection is checked to be not invalid, performing drainage operation on the motor.

5. The method of any one of claims 1-4, wherein the first temperature sensor and the second temperature sensor are NTC thermistors.

6. The motor water inlet detection device is characterized in that a first temperature sensor is arranged at the top of a stator of the motor, and a second temperature sensor is arranged at the bottom of the stator of the motor;

the motor detection device that intakes includes:

The first acquisition unit is used for acquiring a first temperature value acquired by the first temperature sensor and a second temperature value acquired by the second temperature sensor;

The judging unit is used for judging whether the temperature difference value between the first temperature value and the second temperature value obtained by the first obtaining unit is larger than a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition;

And the first determining unit is used for determining that the motor is fed if the judging unit judges that the temperature difference value is larger than a preset temperature difference threshold value of the first temperature sensor and the second temperature sensor under the current operation working condition.

7. The apparatus as recited in claim 6, further comprising:

The second acquisition unit is used for respectively acquiring the maximum temperature difference value between the first temperature value acquired by the first temperature sensor and the second temperature value acquired by the second temperature sensor under each operation condition when the motor does not feed water;

the second determining unit is used for determining preset temperature difference thresholds of the first temperature sensor and the second temperature sensor under each operation condition according to the maximum temperature difference value of the first temperature value and the second temperature value under each operation condition when the motor does not feed water, which is acquired by the second acquiring unit.

8. The apparatus according to claim 6 or 7, further comprising:

and the alarm unit is used for sending out a corresponding alarm signal if the first determination unit determines that the motor is water-feeding.

9. A storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of any of claims 1-5.

10. A vehicle control unit for an electric vehicle, comprising a processor, a memory and a computer program stored on the memory and executable on the processor, which processor, when executing the program, carries out the steps of the method according to any one of claims 1-5, comprising a control device according to any one of claims 6-8.