CN114655014B - Electric drive system, safety early warning method and device of electric drive system - Google Patents
Electric drive system, safety early warning method and device of electric drive system Download PDFInfo
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- CN114655014B CN114655014B CN202011545141.3A CN202011545141A CN114655014B CN 114655014 B CN114655014 B CN 114655014B CN 202011545141 A CN202011545141 A CN 202011545141A CN 114655014 B CN114655014 B CN 114655014B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0061—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
Abstract
The invention belongs to the technical field of electric drive of new energy automobiles, and particularly relates to an electric drive system, and a safety early warning method and device of the electric drive system. The invention sets a temperature sensor at each high-voltage connection point of the electric drive system, which comprises a connection point between a drive motor and a first high-voltage wire harness, a connection point between a motor controller and the first high-voltage wire harness, a connection point between a motor controller and a second high-voltage wire harness, and a connection point between a power battery and the second high-voltage wire harness, wherein the temperature sensor is used for timely finding out abnormal temperature points, judging whether high-voltage early warning protection processing is needed according to the detection result of the temperature sensor in the first time, timely finding out poor high-voltage connection, preventing the high-voltage connection state from further deteriorating, avoiding ablation faults, effectively protecting the safe operation of a vehicle, and improving the reliability and the safety of the vehicle. Moreover, the position of the high-voltage connection point where the problem occurs can be accurately determined so as to be checked in time and the bolt can be fastened again.
Description
Technical Field
The invention belongs to the technical field of electric drive of new energy automobiles, and particularly relates to an electric drive system, and a safety early warning method and device of the electric drive system.
Background
The core parts of the new energy automobile comprise a power battery, a motor controller and a driving motor. The power battery is an energy storage device and provides direct current electric energy. The motor controller inverts the direct current of the battery into three-phase alternating current to drive the motor to rotate. To transfer energy, the battery, motor controller and drive motor are connected by a high voltage harness.
When the high-voltage component is connected with the high-voltage wire harness, a high-voltage electric connection point can be generated, the current common connection mode is to make the contact head into a flat copper bar, a through hole is reserved on the copper bar, and the two copper bars are tightly connected through a bolt. If the bolts are not tightened according to the required moment or the running road conditions of the vehicle are poor, the bolts can be loosened gradually, the two copper bars are not tightly pressed and occasionally generate a tiny gap along with the bumping of the vehicle, so that the contact resistance is increased, and under the condition that the transmission current is unchanged, the resistance is increased, so that the heating is serious. If the bolts are not fastened in time, the bolts are loosened and aggravated, the two copper bars are completely separated, high-voltage arc discharge ablation can occur, and then an electric drive system is burnt out, so that the operation of a vehicle is influenced. How to timely find out the loosening condition of the bolts for early warning and protect the safe and reliable running of the vehicle is an urgent problem to be solved.
Disclosure of Invention
The invention provides an electric driving system, and a safety early warning method and device for the electric driving system, which are used for solving the problem of how to timely find out loosening of bolts for early warning.
In order to solve the technical problems, the technical scheme of the invention comprises the following steps:
the invention provides a safety pre-warning method of an electric drive system, which comprises the following steps:
1) Detecting the temperature of each high-voltage connection point of the electric drive system in real time; the electric driving system comprises a driving motor, a motor controller and a power battery, wherein the driving motor is connected with the motor controller through a first high-voltage wire harness, and the motor controller is connected with the power battery through a second high-voltage wire harness; the high voltage connection point comprises: the connection point between the driving motor and the first high-voltage wire harness, the connection point between the motor controller and the second high-voltage wire harness and the connection point between the power battery and the second high-voltage wire harness;
2) Judging whether a high-pressure connection point with the temperature being greater than a temperature limit value exists or not:
if a high-voltage connection point with the temperature being greater than the temperature limit value exists, judging whether a limit phenomenon that the temperature continuously exceeds the temperature limit value occurs at the high-voltage connection point with the temperature being greater than the temperature limit value; if the limit phenomenon occurs, performing high-voltage early warning protection treatment;
if the high-voltage connection point with the temperature being greater than the temperature limit value does not exist, judging whether the high-voltage connection point with the temperature being greater than the temperature warning value and less than or equal to the temperature limit value exists or not: if so, judging whether a warning phenomenon which is continuously larger than the temperature warning value and smaller than or equal to the temperature limit value occurs at the high-voltage connection point with the temperature larger than the temperature warning value and smaller than or equal to the temperature limit value; if the warning phenomenon occurs, determining whether high-voltage early warning protection processing is performed according to the position of a high-voltage connection point where the warning phenomenon occurs; wherein the temperature warning value is less than a temperature limit value.
The beneficial effects of the technical scheme are as follows: according to the invention, the temperature sensors are arranged at the high-voltage connection points of the electric drive system, so that abnormal temperature points are found timely, whether high-voltage early warning protection treatment is needed or not is judged according to the detection result of the temperature sensors at the first time, poor high-voltage connection is found timely, the high-voltage connection state is prevented from being further deteriorated, ablation faults are avoided, the safe operation of the vehicle is effectively protected, and the reliability and the safety of the vehicle are improved. Moreover, the position of the high-voltage connection point where the problem occurs can be accurately determined so as to be checked in time and the bolt can be fastened again.
As a further improvement of the method, in step 2), the means for determining whether to perform the high-voltage early warning protection processing according to the position of the high-voltage connection point where the warning phenomenon occurs includes:
if the warning phenomenon occurs at the connection point between the power battery and the second high-voltage wire harness, carrying out high-voltage early warning protection treatment;
if the warning phenomenon does not occur at the connection point between the power battery and the second high-voltage wire harness, judging whether the warning phenomenon occurs at the same time at the connection point between the driving motor and the first high-voltage wire harness, at the connection point between the motor controller and the second high-voltage wire harness and at the connection point between the motor controller and the first high-voltage wire harness, and if the warning phenomenon occurs at the same time, performing high-voltage early warning protection treatment.
As a further improvement of the method, in order to effectively protect the safe operation of the vehicle, the high-voltage early warning protection process includes: the instrument displays the abnormal temperature of the high-voltage connection point, and the whole vehicle runs with limited power and stops gradually.
As a further improvement of the method, in order to ensure the running efficiency of the vehicle, in step 3), if the warning phenomenon does not occur at the same time, the whole vehicle continues to run and carries out high-pressure early warning reporting processing.
The invention also provides an electric drive system safety precaution device, which comprises a memory and a processor, wherein the processor is used for executing instructions stored in the memory to realize the electric drive system safety precaution method and achieve the same effect as the method.
The invention also provides an electric driving system, which comprises a driving motor, a motor controller, a power battery, a temperature detection module and an electric driving system safety pre-warning device;
the driving motor is connected with the motor controller through a first high-voltage wire harness, and the motor controller is connected with the power battery through a second high-voltage wire harness;
the temperature detection module comprises a plurality of temperature sensors and is used for detecting the temperature of each high-voltage connection point of the electric drive system in real time, and the high-voltage connection points comprise: the connection point between the driving motor and the first high-voltage wire harness, the connection point between the motor controller and the second high-voltage wire harness and the connection point between the power battery and the second high-voltage wire harness;
the electric drive system safety precaution device comprises a memory and a processor, wherein the processor is used for executing instructions stored in the memory to realize the electric drive system safety precaution method and achieve the same effects as the method.
The driving motor is connected with the first high-voltage wire harness through two conductive bars, namely a driving motor side conductive bar and a first high-voltage wire harness side conductive bar, and the two conductive bars are fixed together through a compression bolt and a base material for fixing the two conductive bars; in order to accurately measure the temperature at the connection point between the driving motor and the first high-voltage wire harness, one part of the temperature sensor for detecting the temperature at the connection point between the driving motor and the first high-voltage wire harness is embedded in the base material, and the other part of the temperature sensor is embedded in the conductive bar contacted with the base material.
Three temperature sensors are arranged at the connection point between the driving motor and the first high-voltage wire harness, three temperature sensors are arranged at the connection point between the motor controller and the first high-voltage wire harness, two temperature sensors are arranged at the connection point between the motor controller and the second high-voltage wire harness, and two temperature sensors are arranged at the connection point between the power battery and the second high-voltage wire harness.
Drawings
FIG. 1 is a schematic diagram of an electric drive system of the present invention;
the device comprises a 1-driving motor, a 2-first high-voltage wire harness, a 3-first low-voltage wire harness, a 4-motor controller, a 5-second high-voltage wire harness, a 6-second low-voltage wire harness and a 7-power battery, wherein the first high-voltage wire harness is connected with the motor controller;
FIG. 2 is a schematic illustration of a temperature sensor arrangement point of the present invention;
three temperature sensors at the connection point between the 21-motor controller and the high-voltage wire harness, two temperature sensors at the connection point between the 22-motor controller and the high-voltage wire harness, three temperature sensors at the connection point between the 23-driving motor and the high-voltage wire harness, two temperature sensors at the connection point between the 24-power battery and the high-voltage wire harness, and a 25-temperature sensor decoding chip;
FIG. 3 is a schematic diagram of the drive motor and high voltage harness connection point configuration of the present invention;
the device comprises a copper bar at the side of an 11-driving motor, a copper bar at the side of a 12-first high-voltage wire harness, a 13-base material, a 14-compression bolt, three temperature sensors at the connecting points between the 23-driving motor and the high-voltage wire harness, and a 3-first low-voltage wire harness;
FIG. 4 is a schematic diagram of the temperature sensor, motor controller, and meter connections of the present invention;
three temperature sensors at the connection points between the 21-motor controller and the high-voltage wire harness, 4-motor controller, 33-meter;
FIG. 5 is a flow chart of an electric drive system safety precaution method of the present invention;
fig. 6 is a block diagram of the safety precaution device of the electric drive system of the present invention.
Detailed Description
The invention detects the temperature of each high-voltage connection point in the electric drive system in real time, can find out the high-voltage connection point with abnormal temperature in time, reminds a driver in the first time, can check in time and fasten the bolt again, avoids the ablation fault of the vehicle, and improves the reliability and safety of the vehicle. An electric drive system, an electric drive system safety warning method, and an electric drive system safety warning device according to the present invention will be described with reference to the accompanying drawings and embodiments.
Electric drive system embodiment:
an embodiment of an electric drive system of the present invention is shown in fig. 1, and the electric drive system includes a drive motor 1, a first high-voltage harness 2, a first low-voltage harness 3, a motor controller 4, a second high-voltage harness 5, a second low-voltage harness 6, a power battery 7, and a temperature detection module.
The power battery 7 transmits direct current to the motor controller 4 through the second high-voltage wire harness 5, and the motor controller 4 inverts the direct current into three-phase alternating current and transmits the three-phase alternating current to the driving motor 1 through the first high-voltage wire harness 2.
In the electric drive system shown in fig. 1, there are 10 similar high voltage connection points, so the temperature detection module includes 10 temperature sensors. As shown in fig. 2, three temperature sensors 21 at the connection point between the motor controller 4 and the first high-voltage harness 2, two temperature sensors 22 at the connection point between the motor controller 4 and the second high-voltage harness 5, three temperature sensors 23 at the connection point between the drive motor 1 and the first high-voltage harness 2, two temperature sensors 24 at the connection point between the power battery 7 and the second high-voltage harness 5 are included for detecting the temperatures at the respective high-voltage connection points, respectively.
The arrangement positions of the respective sensors are similar, and a temperature sensor arrangement position at the connection point between the drive motor 1 and the first high-voltage harness 2 will be described as an example. As shown in fig. 3, the driving motor 1 and the first high-voltage wire harness 2 are connected by two copper bars, namely, a driving motor side copper bar 11 and a high-voltage wire harness side copper bar 12, which are fixed together by a pressing bolt 14 and a base material 13 for fixing the copper bars. The copper bar 11 on the side of the driving motor is connected with an internal coil of the driving motor, and the copper bar 12 on the side of the first high-voltage wire harness is connected with the first high-voltage wire harness 2; the base material 13 is an insulating material, is provided with a threaded hole and is inlaid with a steel wire thread insert; the pressing bolt 14 presses the first high-voltage harness side copper bar 12 and the driving motor side copper bar 11 into close contact. The temperature sensor 23 is partially embedded in the copper bar 11 at the side of the driving motor and partially embedded in the base material 13 and is used for detecting the temperature of the copper bar so as to realize temperature detection at the connection point between the driving motor and the first high-voltage wire harness. The other temperature sensors are disposed in similar positions, and will not be described in detail herein. Wherein the first low voltage harness 3 is used for transmitting signals detected by the temperature sensor 23 and the second low voltage harness 6 is used for transmitting signals detected by the two temperature sensors 24 at the connection point of the power battery 7 and the second high voltage harness 5.
As shown in fig. 3, the temperature sensors 21 to 24 monitor the temperature of the copper bar at each high-voltage connection point in real time, and transmit the temperature to the temperature sensor decoding chip 25 of the motor controller 4 in real time, and the temperature sensor decoding chip is analyzed and then transmitted to the controller control chip. In addition, a software program is stored in the motor controller 4, the software program is an electric drive system safety precaution method, and the software program and hardware form the whole electric drive system.
As shown in fig. 4, the electric drive system further comprises a meter 33. When the temperature at the high-voltage connection point is higher than the set limit value (comprising a temperature limit value and a temperature warning value, wherein the temperature warning value is smaller than the temperature limit value, and the two values are required to be obtained according to a test), the instrument can display reminding contents such as 'the high-voltage connection point is over-temperature, please stop and check in time', and the like, and can accurately display the position of the high-voltage connection point with a problem according to the requirement, discover the poor high-voltage connection in time, prevent the high-voltage connection state from further deteriorating and avoid ablation faults.
A method for early warning of electric drive system safety according to the present invention will be described in detail with reference to fig. 5.
Step one, starting an early warning function in the whole vehicle operation process.
And step two, the temperature detection module detects the temperature of each high-voltage connection point in real time.
Step three, judging whether the temperature at the high-voltage connection point is greater than a temperature limit value or not:
if the temperature at the high-voltage connection point is greater than the temperature limit value, recording the high-voltage connection point with the phenomenon, the temperature of the high-voltage connection point and the abnormality, and executing the fourth step;
if the temperature at no high-voltage connection point is greater than the temperature limit value, step six is performed.
Judging whether a limit phenomenon continuously exceeding a temperature limit value occurs at a high-voltage connection point with the temperature exceeding the temperature limit value:
if the limit phenomenon occurs, executing a step five;
if the limit phenomenon does not occur, the monitoring is carried out again after 10 seconds, and the third step is returned to continue to judge.
Step five, high-voltage early warning protection treatment is carried out, the instrument displays that the temperature of the high-voltage connection point is abnormal so as to prompt a driver, and the driver can check in time and fasten the compression bolt again; meanwhile, an instruction is sent to the whole vehicle VCU, and after the VCU receives the instruction, the whole vehicle is subjected to power output limitation and is stopped step by step.
Step six, judging whether the temperature at the high-voltage connection point is greater than a temperature warning value and less than or equal to a temperature limit value or not:
if the temperature at the high-voltage connection point is larger than the temperature warning value and smaller than or equal to the temperature limit value, recording the high-voltage connection point with the phenomenon, the temperature of the high-voltage connection point and the abnormality, and executing the step seven.
Step seven, judging whether a warning phenomenon which is continuously larger than the temperature warning value and smaller than or equal to the temperature limit value appears at the high-voltage connection point with the temperature larger than the temperature warning value and smaller than or equal to the temperature limit value or not:
if the warning phenomenon occurs, executing the step eight;
if the warning phenomenon does not appear, detecting again after 30 seconds, and returning to the execution of the step three to continue judgment.
Step eight, counting the number and distribution of high-voltage connection points with warning phenomenon:
if the warning phenomenon occurs at the high-voltage point of the battery (the connection point between the power battery and the second high-voltage wire harness), executing a step five;
if the warning phenomenon does not occur at the high-voltage point of the battery, judging whether the warning phenomenon occurs at the high-voltage point of the integrated controller (comprising a connection point between the motor controller and the first high-voltage wire harness and a connection point between the motor controller and the second high-voltage wire harness) and the high-voltage point of the motor (a connection point between the driving motor and the first high-voltage wire harness) at the same time, and if the warning phenomenon occurs at the same time, executing a fifth step; if the vehicle is not in the same time, the high-voltage early warning is reported to the background, the vehicle continues to run, and the third step is executed.
In this embodiment, the electric driving system safety precaution device is actually a motor controller, and the memory and the processor in the electric driving system safety precaution device are both the memory and the processor in the motor controller. As other embodiments, the electric drive system safety pre-warning device may also be a whole vehicle controller.
According to the invention, the temperature sensor is arranged at the high-voltage connection point, so that the temperature of the high-voltage connection point can be detected in real time, the temperature abnormality can be found in time, and the reliability and safety of the vehicle are improved; the device is linked with devices such as an instrument, so that abnormality can be found in time, a driver is reminded of the abnormality at the first time, and ablation faults are avoided; moreover, each high-voltage connection point is accurately monitored, and functions of reminding, active power-off stopping and the like can be set according to the temperature, so that extreme situations are avoided; the operation safety of the vehicle is effectively protected, and fault false alarm is avoided.
Method embodiment:
the flow of the embodiment of the safety pre-warning method of the electric drive system is shown in fig. 5, and the method is described in detail in the embodiment of the system, and is not repeated here.
Device example:
an embodiment of the safety early warning device of the electric drive system of the invention is shown in fig. 6, and comprises a memory, a processor and an internal bus, wherein the processor and the memory complete mutual communication and data interaction through the internal bus. The memory includes at least one software functional module stored in the memory; the processor performs various functional applications and data processing by running software programs and modules stored in the memory. The memory is used for storing a program, and the processor executes the program after receiving an execution instruction, so that the safety early warning method of the electric drive system is realized, which is described in detail in the system embodiment of the invention.
The processor may be a processor in a motor controller in the system embodiment, or may be other processing devices added to the whole vehicle, such as a microprocessor MCU, a programmable logic device FPGA, and the like.
The memory may be a memory in a motor controller in the system embodiment, or may be other storage devices added to the whole vehicle, for example, various memories, RAM, ROM, etc. that store information by using electric energy; the magnetic storage device can also be various memories for storing information by utilizing a magnetic energy mode, such as a hard disk, a floppy disk, a magnetic tape, a magnetic core memory, a bubble memory, a U disk and the like; various memories for optically storing information, such as CDs, DVDs, etc.; of course, other types of memory are also possible, such as quantum memory, graphene memory, etc.
Claims (8)
1. The safety early warning method of the electric drive system is characterized by comprising the following steps of:
1) Detecting the temperature of each high-voltage connection point of the electric drive system in real time; the electric driving system comprises a driving motor, a motor controller and a power battery, wherein the driving motor is connected with the motor controller through a first high-voltage wire harness, and the motor controller is connected with the power battery through a second high-voltage wire harness; the high voltage connection point comprises: the connection point between the driving motor and the first high-voltage wire harness, the connection point between the motor controller and the second high-voltage wire harness and the connection point between the power battery and the second high-voltage wire harness;
2) Judging whether a high-pressure connection point with the temperature being greater than a temperature limit value exists or not:
if a high-voltage connection point with the temperature being greater than the temperature limit value exists, judging whether a limit phenomenon that the temperature continuously exceeds the temperature limit value occurs at the high-voltage connection point with the temperature being greater than the temperature limit value; if the limit phenomenon occurs, performing high-voltage early warning protection treatment;
if the high-voltage connection point with the temperature being greater than the temperature limit value does not exist, judging whether the high-voltage connection point with the temperature being greater than the temperature warning value and less than or equal to the temperature limit value exists or not: if so, judging whether a warning phenomenon which is continuously larger than the temperature warning value and smaller than or equal to the temperature limit value occurs at the high-voltage connection point with the temperature larger than the temperature warning value and smaller than or equal to the temperature limit value; if the warning phenomenon occurs, determining whether high-voltage early warning protection processing is performed according to the position of a high-voltage connection point where the warning phenomenon occurs; wherein the temperature warning value is less than a temperature limit value.
2. The method of claim 1, wherein in step 2), the means for determining whether to perform the high voltage warning protection process according to the position of the high voltage connection point where the warning phenomenon occurs comprises:
if the warning phenomenon occurs at the connection point between the power battery and the second high-voltage wire harness, carrying out high-voltage early warning protection treatment;
if the warning phenomenon does not occur at the connection point between the power battery and the second high-voltage wire harness, judging whether the warning phenomenon occurs at the same time at the connection point between the driving motor and the first high-voltage wire harness, at the connection point between the motor controller and the second high-voltage wire harness and at the connection point between the motor controller and the first high-voltage wire harness, and if the warning phenomenon occurs at the same time, performing high-voltage early warning protection treatment.
3. The electric drive system safety precaution method of claim 1, wherein the high voltage precaution protection process comprises: the instrument displays the abnormal temperature of the high-voltage connection point, and the whole vehicle runs with limited power and stops gradually.
4. The method according to claim 2, wherein in step 3), if the warning phenomenon does not occur at the same time, the whole vehicle continues to run and performs high-voltage warning reporting.
5. An electric drive system safety precaution device comprising a memory and a processor for executing instructions stored in the memory to implement the electric drive system safety precaution method of any one of claims 1 to 4.
6. The electric driving system is characterized by comprising a driving motor, a motor controller, a power battery, a temperature detection module and an electric driving system safety pre-warning device;
the driving motor is connected with the motor controller through a first high-voltage wire harness, and the motor controller is connected with the power battery through a second high-voltage wire harness;
the temperature detection module comprises a plurality of temperature sensors and is used for detecting the temperature of each high-voltage connection point of the electric drive system in real time, and the high-voltage connection points comprise: the connection point between the driving motor and the first high-voltage wire harness, the connection point between the motor controller and the second high-voltage wire harness and the connection point between the power battery and the second high-voltage wire harness;
the electric drive system safety precaution device comprises a memory and a processor for executing instructions stored in the memory to implement the electric drive system safety precaution method of any one of claims 1 to 4.
7. The electric drive system of claim 6, wherein the drive motor is connected to the first high voltage wire harness by two conductor bars, a drive motor side conductor bar and a first high voltage wire harness side conductor bar, respectively, the two conductor bars being secured together by a hold-down bolt and a base material for securing the two conductor bars; one part of the temperature sensor for detecting the temperature at the connection point between the driving motor and the first high-voltage wire harness is embedded in the base material, and the other part of the temperature sensor is embedded in the conductive bar contacted with the base material.
8. The electric drive system of claim 6, wherein three temperature sensors are disposed at a connection point between the drive motor and the first high voltage harness, three temperature sensors are disposed at a connection point between the motor controller and the first high voltage harness, two temperature sensors are disposed at a connection point between the motor controller and the second high voltage harness, and two temperature sensors are disposed at a connection point between the power battery and the second high voltage harness.
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