CN115754530A - Electric drive assembly durability test method with direct-current boosting and charging function - Google Patents
Electric drive assembly durability test method with direct-current boosting and charging function Download PDFInfo
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- CN115754530A CN115754530A CN202211427863.8A CN202211427863A CN115754530A CN 115754530 A CN115754530 A CN 115754530A CN 202211427863 A CN202211427863 A CN 202211427863A CN 115754530 A CN115754530 A CN 115754530A
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Abstract
The invention relates to an electric drive assembly endurance test method with a direct-current boosting and charging function, which comprises the following steps of: s1, building a system; s2, carrying out an initial durability test on the built system according to a preset test; s3, electrifying the system at low voltage and high voltage, and controlling an electric drive assembly to carry out direct-current boost charging on a simulation bench high-voltage power supply II in the system, wherein the charging electric quantity is Q; s4, simulating the actual running working condition of the whole vehicle by an electric drive assembly in the control system, and recording the current mileage L1 of the electric drive assembly; circulating S3 and S4 until the total mileage of the electric drive assembly reaches a preset service life mileage L, and completing an electric drive assembly driving and power generation working condition endurance test and an electric drive assembly direct-current boosting charging endurance test of the system; s5, carrying out durability test retesting on the built system according to a preset test; s6, verifying whether the system is normal after circulating S3 and S4 according to the initial test result and the retest result of the endurance test; and S7, disassembling the system to form a disassembly report.
Description
Technical Field
The invention belongs to the field of new energy electric drive assemblies, and particularly relates to an electric drive assembly durability test method with a direct-current boosting charging function.
Background
The new energy automobile enters a high-speed development stage, a battery is used as an energy source of the electric automobile and is the most core part of the electric automobile, the voltage range of the current battery is uneven, and the charging voltage of the battery is necessarily larger than the self voltage, so that the battery cannot be charged when meeting a charging pile with higher voltage, and a direct-current boosting function is one of the methods for solving the problem.
Current electric automobile all has life-span requirement in use, and direct current steps up as a function on the electric automobile, also needs to satisfy life-span demand, consequently needs carry out long-time endurance test to direct current step up function. The service life of the current electric automobile is generally more than 10 years and 30 kilometers, and if the direct current boost voltage is verified according to the time, a great deal of time and energy are needed. Therefore, there is a need for a system and method for verifying electric drive and dc boost endurance that can verify both the electric drive assembly and the dc boost endurance and that can reduce test time.
In the technical scheme with the application number of CN201811574191.7, only the electric driving, boosting and charging functions are described, and the durability verification is not described; there is no relevant document on the durability of the DC boost.
Disclosure of Invention
In view of this, the embodiment of the present invention provides an endurance test method for an electric drive assembly with a dc boost charging function, which can perform endurance verification on the driving and power generation conditions of the electric drive assembly and the dc boost function of the multiplex electric drive assembly according to the actual life requirement of the electric vehicle.
The technical scheme of the invention is as follows:
the invention provides an electric drive assembly endurance test method with a direct-current boosting and charging function, which comprises the following steps of:
s1, building an electric drive assembly durability test system;
s2, carrying out an endurance test initial test on the built electric drive assembly endurance test system according to a preset test step;
s3, standing the electric drive assembly endurance test system for a preset time;
s4, after the endurance test initial test is completed, carrying out low-voltage power-on and high-voltage power-on the electric drive assembly endurance test system, and then controlling the electric drive assembly to simulate a whole vehicle direct-current boost charging strategy to carry out direct-current boost charging on a simulation bench high-voltage power supply II in the electric drive assembly endurance test system, wherein the charging electric quantity is Q;
s5, controlling an electric drive assembly in the electric drive assembly endurance test system to simulate the actual running working condition of the whole vehicle to run so as to finish the consumption of the electric quantity Q charged by a simulation rack high-voltage power supply II in the electric drive assembly endurance test system and record the current mileage L1 of the electric drive assembly;
the steps S4 and S5 are circulated until the total mileage of the electric drive assembly reaches the preset service life mileage L, and the electric drive assembly driving and power generation working condition endurance test and the electric drive assembly direct-current boost charging endurance test of the electric drive assembly endurance test system are completed;
s6, carrying out durability test retesting on the built electric drive assembly durability test system according to a preset test step;
s7, verifying whether the electric drive assembly endurance test system is normal after the steps S4 and S5 are circulated according to the endurance test initial test result and the endurance test retest result;
and S8, disassembling the electric drive assembly durability test system to form a disassembly report.
Preferably, in step S1, the built electric drive assembly endurance testing system includes: the system comprises a bench upper computer, an electric drive assembly, an electric dynamometer, a bench high-voltage power supply I, a low-voltage power supply, a battery pack and a power analyzer, wherein the electric drive assembly consists of a motor controller, a motor and a speed reducer;
the steps of constructing the electric drive assembly endurance testing system include:
respectively erecting a charging pile end of a first high-voltage power supply and a battery pack by a motor controller;
connecting a low-voltage end of the motor controller to a low-voltage power supply;
connecting the output end of the motor to an electric dynamometer through a speed reducer;
connecting a power analyzer to the motor controller, wherein the power analyzer is used for measuring the direct current boost output power of the motor controller;
the bench host computer is used for being connected with the first bench high-voltage power supply, the battery pack, the low-voltage power supply, the motor controller and the power analyzer.
Preferably, in the process of executing step S4, the method further comprises:
and S9, if the direct current boosting output power measured by the upper computer of the rack according to the power analyzer is not within a preset power range, outputting a result that the driving and power generation working condition endurance test of the electric drive assembly and the direct current boosting charging endurance test of the electric drive assembly do not pass.
Preferably, the contents of performing the endurance test preliminary test in step S2 and performing the endurance test retest in step S6 both include:
and carrying out peak value external characteristic test, insulation resistance test and motor back electromotive force test on the electric drive assembly durability test system.
Preferably, the step of conducting an off-peak performance test on the electric drive assembly endurance testing system comprises:
the upper computer of the rack controls the second high-voltage power supply of the rack to output the lowest working voltage, the rated working voltage and the highest working voltage of the electric drive assembly, and the peak external characteristic of the electric drive assembly is measured through the electric dynamometer so as to judge whether the peak external characteristic of the electric drive assembly meets the preset peak external characteristic requirement.
Preferably, the step of testing the endurance test system of the electric drive assembly for insulation resistance comprises:
the four-phase line and the high-voltage port which are connected with the motor controller and the motor are connected to the anode of the insulation withstand voltage tester, all the wiring terminals of the low-voltage port in the electric drive assembly endurance test system and the shell are connected to the cathode of the insulation withstand voltage tester, and the insulation requirement of the electric drive assembly is determined to meet the insulation requirement specified in advance according to the detection result of the insulation withstand voltage tester.
Preferably, the step of testing the back emf of the electric drive assembly endurance testing system comprises:
disconnecting the three-phase copper bar of the motor controller from the three-phase terminal of the motor, respectively connecting the voltage probes of the oscilloscope with the three phase lines of U, V and W of the motor, dragging the motor to a rated maximum rotating speed point at intervals of 1000rpm by using a dynamometer, and respectively testing the three-phase back electromotive force of the motor by the oscilloscope so as to determine whether the back electromotive force meets the pre-specified back electromotive force requirement.
Preferably, the battery pack is a rack high-voltage power supply II simulating a battery pack of a whole vehicle or a battery pack of an actual vehicle.
Preferably, in step S8, if the peak external characteristic variation difference of the electric drive assembly endurance test system in the initial test result and the retest result is within the preset variation range, the insulation resistance of the high-voltage end of the motor controller and the insulation resistance of the low-voltage end of the motor controller in the initial test result and the retest result are both within the preset resistance ranges respectively corresponding to the peak external characteristic variation differences, and the motor back electromotive force difference in the initial test result and the retest result is within the preset back electromotive force difference variation range, it is determined that the electric drive assembly endurance test system successfully completes the electric drive assembly driving and generating condition endurance test and the electric drive assembly dc boosting endurance test for the predetermined number of times.
Preferably, the electric drive assembly is a water-cooled electric drive assembly or an oil-cooled electric drive assembly.
The invention has the beneficial effects that:
by using the testing method, the electric drive assembly with the direct-current boosting charging function can be subjected to the direct-current boosting charging endurance test and the endurance test of the power generation working condition and the driving working condition at the same time. When the electric drive assembly is used for carrying out a direct-current boost charging endurance test, the electric drive assembly boosts direct current output by the first rack high-voltage power supply and then outputs the boosted direct current to the battery pack to realize direct-current boost charging of the battery pack; after the battery pack is charged, when the electric drive assembly carries out the endurance test of the power generation working condition and the driving working condition, the motor in the electric drive assembly simulates the real vehicle to allow the working condition to consume the charging electric quantity of the battery pack by driving the electric dynamometer which is used as a load to operate. The direct current boost charging of the battery pack is carried out in a circulating mode, then the electric drive assembly is used for consuming the charging electric quantity, and meanwhile, the durability test of the direct current boost charging function of the electric drive assembly and the durability test of the driving and power generation working conditions of the electric drive assembly during the simulation of the working condition of the real vehicle are realized. Compared with the verification of the whole vehicle, the method can greatly shorten the time required by the test, reduce the test resource investment, greatly improve the efficiency and reduce the test cost. Compared with manual operation, the automatic test bench has the advantages that personnel investment and misoperation risks can be reduced, test safety and operability are improved, bench test progress can be accelerated, and test cost is reduced.
Drawings
FIG. 1 is a block diagram of an electric drive assembly endurance testing system in an embodiment of the present invention;
FIG. 2 is a flowchart of a testing method according to an embodiment of the present invention.
Detailed Description
The following will explain the embodiment of the present invention and the practical operation process of the rack automatically controlling the on/off of the dc boost function by combining with the design schematic diagram of the present invention. The embodiments shown are only a part of the disclosure, but all fall within the scope of the present invention, because the core technical points of the present invention need to be protected.
The embodiment of the invention provides an electric drive assembly durability test method with a direct-current boosting and charging function.
Referring to fig. 2, the method in the embodiment of the present invention includes:
and S101, building an electric drive assembly durability test system.
In this embodiment, referring to fig. 1, modules or devices related to the system include: the system comprises a bench upper computer, an electric drive assembly consisting of a motor controller, a motor and a speed reducer, an electric dynamometer used as a motor load, a bench high-voltage power supply I for simulating a charging pile, a low-voltage power supply, a battery pack and a power analyzer.
Wherein, the assembly that drives electrically needs to carry out the await measuring sample spare of endurance test as this embodiment, and the assembly that drives electrically can drive the assembly for water-cooling electricity and also can drive the assembly for oil cooling electricity, and the cooling method that drives the assembly electrically does not influence its endurance test result. The connection among the motor controller, the motor and the reducer in the electric drive assembly is the prior art. The first rack high-voltage power supply is used for charging the electric pile to output direct-current voltage, the battery pack is a second rack high-voltage power supply or an actual vehicle battery pack (in the embodiment, in fig. 1, the battery pack is represented in a mode of the second rack high-voltage power supply) for simulating a battery pack of the whole vehicle, the battery pack can receive direct current input by the electric driving assembly to form electric quantity storage, and the battery pack can also serve as a power supply to output the direct current to the electric driving assembly.
In this embodiment, the step of building the durable test system of electric drive assembly specifically includes: respectively erecting a charging pile end of a first high-voltage power supply and a battery pack by a motor controller; connecting a low-voltage end of the motor controller to a low-voltage power supply; connecting the output end of the motor to an electric dynamometer through a speed reducer; connecting a power analyzer to the motor controller, wherein the power analyzer is used for measuring the direct current boosting output power of the motor controller; the bench host computer is used for being connected with the first bench high-voltage power supply, the battery pack, the low-voltage power supply, the motor controller and the power analyzer.
The low-voltage power supply is used as a control power supply of the motor controller, and the electric dynamometer is used as an output load of the motor.
After the system building of step S101 is completed, an electric drive assembly endurance testing system needs to be initially tested, that is, step S102, and the test items include: the method comprises the steps of testing the peak external characteristics, testing the insulation resistance and testing the back electromotive force of the motor.
The off-peak characteristic test refers to: the bench host computer controls the output voltage of the second high-voltage power supply of the bench, the input voltage is specifically the rated working voltage of the electric drive assembly and is respectively set to be three points of the lowest working voltage, the rated working voltage and the highest working voltage, and the peak value external characteristic of the electric drive assembly is tested through the electric dynamometer so as to judge whether the peak value external characteristic of the electric drive assembly meets the preset peak value external characteristic requirement or not.
The specific process of the insulation resistance test comprises the following steps: the method comprises the steps that four phase lines and a high-voltage port which are connected with a motor controller and the motor are connected to the anode of an insulation withstand voltage tester, all wiring ends of a low-voltage port in an electric drive assembly durability test system and a shell are connected to the cathode of the insulation withstand voltage tester, the insulation resistance of the high-voltage port of the motor controller to a shell is tested by using the insulation resistance tester, the insulation resistance of the low-voltage port of the motor controller to the shell is tested by using the insulation resistance tester, and whether the insulation requirement of the electric drive assembly meets the preset insulation requirement or not is determined according to the detection result of the insulation withstand voltage tester.
The step of testing the counter electromotive force of the motor comprises the following steps: the method comprises the steps of respectively connecting a voltage probe of an oscilloscope with three phase lines of U, V and W of a motor, dragging the motor to a rated maximum rotating speed point at the interval of 1000rpm of the rotating speed of the motor by using a dynamometer, and respectively testing three-phase counter electromotive force of the motor through the oscilloscope to determine whether the counter electromotive force meets the pre-specified counter electromotive force requirement. During testing, the three-phase copper bar of the motor controller is required to be disconnected from the three-phase terminal of the motor, a high-voltage differential probe of the oscilloscope is connected with the U phase and the V phase of the motor, the dynamometer is used for dragging the electric drive assembly to operate to a certain rotating speed, and the oscilloscope is used for recording counter electromotive force values at two rotating speeds. And after the test is finished, the connection between the three-phase copper bar of the motor controller and the three-phase terminal of the motor is recovered.
The above initial test items are only required by examples, and the actual initial test items can be adjusted according to the requirements of the electric drive assembly.
Step S103 is: and standing the electric drive assembly for a preset time T1 hour.
Specifically, prior to testing, the electric drive assembly needs to be sufficiently immersed in the testing environment to enable the testing conditions of the electric drive assembly to be closer to the surrounding environment. Therefore, T1 can be determined according to the actual situation, and the effect time is reached.
And S104, the rack upper computer controls the low-voltage power supply to electrify the motor controller in a low voltage manner, and determines that the communication CAN of the rack upper computer and the electric drive assembly is normal, the CAN is calibrated to be normal and an oil pump signal (the oil pump signal exists only when the electric drive assembly is an oil-cooling electric drive assembly) is normal according to a signal sent by the electric drive assembly.
Specifically, in step S4, after the low voltage is powered on, if the communication CAN, the calibration CAN signal, and the oil pump signal are normal, the next test is performed; if one signal is abnormal, the low-voltage signal is checked, and the problem is searched and solved.
And S105, the upper rack computer controls high-voltage electrification, sends a direct-current boosting charging instruction to the electric drive assembly, charges the battery pack, continuously increases the voltage of the battery pack during charging, adjusts the boosting ratio according to a whole vehicle direct-current boosting charging strategy of the electric drive assembly, charges the battery pack until the required electric quantity Q is reached, and stops charging when the time is t 2.
In the process of executing the step S105, if the dc boost output power measured by the rack upper computer according to the power analyzer is not within the preset power range, the results of the driving and power generating condition endurance test of the electric drive assembly and the dc boost charging endurance test of the electric drive assembly are output.
Specifically, after the high voltage is powered on, whether the condition of the rack meets the direct current boosting requirement needs to be judged, in the example, the signal is only used as a reference, and the condition can be actually adjusted according to the rack system and the electric driving assembly.
The required electric quantity Q and the working time t2 are the actual direct-current boosting charging time of the simulated vehicle, and can be adjusted according to actual conditions and specific requirements.
And S106, the upper computer of the rack sends a command of entering a torque mode to the electric driving assembly, the electric driving assembly runs to consume power to the direct current boosting charging electric quantity Q under a specific electric driving durability working condition K (simulating the actual running working condition of the whole vehicle), the electric driving mileage is recorded to be L1, and a command of ending the torque control mode is sent.
And (5) circularly executing the steps S5 and S6 until the total mileage of the electric drive assembly reaches the preset service life mileage L, and completing the electric drive assembly driving and power generation working condition endurance test and the electric drive assembly direct-current boosting charging endurance test of the electric drive assembly endurance test system. L is the longest life mileage required by the test, so that the method can be adjusted according to the test requirement.
Particularly, after the direct current boosting of the real vehicle is completed, the reliability of the electrically-driven whole vehicle is checked, and the durability driving working condition or the power generation working condition can be set for enterprises under the specific electrically-driven durability working condition K. In particular, the working condition K can be completed before the dc boost charging endurance test is performed, and the step can be simply performed with rotation simulation at a small rotation speed.
In this embodiment, each time the test executes the loop of steps S5 and S6 for N times, the back electromotive force test of the motor needs to be performed, mainly for checking and identifying the condition of the electric drive assembly, and identifying the risk in advance.
And step S107, performing retesting on the electric drive assembly endurance test system, and synchronizing with the step S102.
Specifically, the purpose of the retest is to verify whether the electric drive assembly is still functioning normally, whether the durability test of the dc boost function affects the normal use of the electric drive system, and whether the dc boost charging performance of the electric drive assembly is degraded.
And S108, disassembling the electric drive assembly to form a disassembly report. Specifically, disassembly is the checking of the internal components of the electric drive assembly for damage.
By using the testing method, the embodiment of the invention can simultaneously carry out the direct-current boost charging endurance test and the endurance test of the power generation working condition and the driving working condition on the electric drive assembly with the direct-current boost charging function. When the electric drive assembly is used for carrying out a direct-current boost charging endurance test, the electric drive assembly boosts direct current output by the first rack high-voltage power supply and then outputs the boosted direct current to the battery pack to realize direct-current boost charging of the battery pack; after the battery pack is charged, when the electric drive assembly carries out the power generation working condition and the driving working condition endurance test, the motor in the electric drive assembly simulates the real vehicle to allow the working condition to consume the charging electric quantity of the battery pack through driving the electric dynamometer as a load to operate. The direct current boost charging of the battery pack is executed in a circulating mode, then the electric drive assembly is used for consuming the charging electric quantity, and meanwhile, the durability test of the direct current boost charging function of the electric drive assembly and the durability test of the driving and power generation working conditions of the electric drive assembly during the simulation of the working condition operation of the real vehicle are realized. Compared with the verification of the whole vehicle, the method can greatly shorten the time required by the test, reduce the test resource investment, greatly improve the efficiency and reduce the test cost. Compared with manual operation, the automatic test bench has the advantages that personnel investment and misoperation risks can be reduced, test safety and operability are improved, bench test progress can be accelerated, and test cost is reduced.
While only one or a few examples of the present invention have been described herein, it will be appreciated by those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the invention is not to be limited to the embodiments described herein.
Claims (10)
1. An electric drive assembly endurance test method with a direct current boost charging function is characterized by comprising the following steps:
s1, building an electric drive assembly durability test system;
s2, carrying out an endurance test initial test on the built electric drive assembly endurance test system according to a preset test step;
s3, standing the electric drive assembly endurance test system for a preset time;
s4, after the endurance test initial test is completed, carrying out low-voltage power-on and high-voltage power-on the electric drive assembly endurance test system, and then controlling the electric drive assembly to simulate a whole vehicle direct-current boost charging strategy to carry out direct-current boost charging on a simulation bench high-voltage power supply II in the electric drive assembly endurance test system, wherein the charging electric quantity is Q;
s5, controlling an electric drive assembly in the electric drive assembly endurance testing system to simulate the actual running working condition of the whole vehicle to run so as to finish the consumption of the electric quantity Q charged by a simulation rack high-voltage power supply II in the electric drive assembly endurance testing system and record the current mileage L1 of the electric drive assembly;
the steps S4 and S5 are circulated until the total mileage of the electric drive assembly reaches the preset service life mileage L, and the electric drive assembly driving and power generation working condition endurance test and the direct-current boost charging endurance test of the electric drive assembly are completed;
s6, carrying out durability test retesting on the built electric drive assembly durability test system according to a preset test step;
s7, verifying whether the electric drive assembly endurance test system is normal after the steps S4 and S5 are circulated according to the endurance test initial test result and the endurance test retest result;
and S8, disassembling the electric drive assembly durability test system to form a disassembly report.
2. The electric drive assembly endurance testing method with the direct-current boost charging function according to claim 1, wherein in step S1, the electric drive assembly endurance testing system is constructed to include: the system comprises a bench upper computer, an electric drive assembly, an electric dynamometer, a bench high-voltage power supply I, a low-voltage power supply, a battery pack and a power analyzer, wherein the electric drive assembly consists of a motor controller, a motor and a speed reducer, the electric dynamometer is used as a motor load, and the bench high-voltage power supply I, the low-voltage power supply, the battery pack and the power analyzer simulate a charging pile;
the steps of constructing the electric drive assembly endurance testing system include:
respectively erecting a charging pile end of a first high-voltage power supply and a battery pack by a motor controller;
connecting a low-voltage end of the motor controller to a low-voltage power supply;
connecting the output end of the motor to an electric dynamometer through a speed reducer;
connecting a power analyzer to the motor controller, wherein the power analyzer is used for measuring the direct current boost output power of the motor controller;
the bench host computer is used for being connected with the first bench high-voltage power supply, the battery pack, the low-voltage power supply, the motor controller and the power analyzer.
3. The electric drive assembly endurance testing method with dc boost charging capability of claim 1, further comprising, during execution of step S4:
and S9, if the direct current boosting output power measured by the upper computer of the rack according to the power analyzer is not within a preset power range, outputting a result that the driving and power generation working condition endurance test of the electric drive assembly and the direct current boosting charging endurance test of the electric drive assembly do not pass.
4. The method for testing the endurance of the electric drive assembly with the dc boost charging function of claim 1, wherein the performing of the endurance test initial test in step S2 and the performing of the endurance test retest in step S6 each comprise:
and carrying out peak value external characteristic test, insulation resistance test and motor back electromotive force test on the electric drive assembly durability test system.
5. The method as claimed in claim 4, wherein the step of testing the off-peak characteristic of the electric drive assembly endurance testing system comprises:
the rack upper computer controls the lowest working voltage, the rated working voltage and the highest working voltage of the two output electric drive assemblies of the rack high-voltage power supply, and the peak value external characteristic of the electric drive assemblies is measured through the electric dynamometer so as to judge whether the peak value external characteristic of the electric drive assemblies meets the requirement of the preset peak value external characteristic.
6. The method for testing the durability of an electric drive assembly with a dc boost charging function as claimed in claim 4, wherein the step of performing the insulation resistance test on the electric drive assembly durability test system comprises:
the four-phase line and the high-voltage port which are connected with the motor controller and the motor are connected to the anode of the insulation withstand voltage tester, all the wiring terminals of the low-voltage port in the electric drive assembly endurance test system and the shell are connected to the cathode of the insulation withstand voltage tester, and the insulation requirement of the electric drive assembly is determined to meet the insulation requirement specified in advance according to the detection result of the insulation withstand voltage tester.
7. The method for testing the durability of the electric drive assembly with the function of boosting and charging direct current according to claim 4, wherein the step of testing the back electromotive force of the motor for the durability test system of the electric drive assembly comprises the following steps:
disconnecting the three-phase copper bar of the motor controller from the three-phase terminal of the motor, respectively connecting the voltage probes of the oscilloscope with the three phase lines of U, V and W of the motor, dragging the motor to a rated maximum rotating speed point at intervals of 1000rpm by using a dynamometer, and respectively testing the three-phase back electromotive force of the motor by the oscilloscope so as to determine whether the back electromotive force meets the pre-specified back electromotive force requirement.
8. The electric drive assembly endurance testing method with the dc boost charging function of claim 2, wherein the battery pack is a rack high voltage power supply for simulating a battery pack of a whole vehicle or a battery pack of a real vehicle.
9. Method for testing the endurance of an electric drive assembly with a dc boost charging function according to claim 1,
in step S8, if the peak external characteristic variation difference of the electric drive assembly durability test system in the initial test result and the retest result is within the preset variation range, the insulation resistance of the motor controller high-voltage terminal to the housing and the insulation resistance of the motor controller low-voltage terminal to the housing in the initial test result and the retest result are both within the respective corresponding preset resistance ranges, and the motor back electromotive force difference in the initial test result and the retest result is within the preset back electromotive force variation range, it is determined that the electric drive assembly durability test system successfully completes the electric drive assembly driving and power generation condition durability test and the electric drive assembly dc boost durability test for the predetermined number of times.
10. The durability test method for the electric drive assembly with the direct current boost charging function according to claim 1 or 2, characterized in that the electric drive assembly is a water-cooling electric drive assembly or an oil-cooling electric drive assembly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211427863.8A CN115754530A (en) | 2022-11-15 | 2022-11-15 | Electric drive assembly durability test method with direct-current boosting and charging function |
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| CN202211427863.8A CN115754530A (en) | 2022-11-15 | 2022-11-15 | Electric drive assembly durability test method with direct-current boosting and charging function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116736024A (en) * | 2023-08-08 | 2023-09-12 | 小米汽车科技有限公司 | Temperature determining method and device for node to be detected in electric drive system, vehicle and medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116736024A (en) * | 2023-08-08 | 2023-09-12 | 小米汽车科技有限公司 | Temperature determining method and device for node to be detected in electric drive system, vehicle and medium |
| CN116736024B (en) * | 2023-08-08 | 2023-10-17 | 小米汽车科技有限公司 | Temperature determining method and device for node to be detected in electric drive system, vehicle and medium |
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