CN112394251A - Electric drive system drag rack and electric drive system drag test method - Google Patents
Electric drive system drag rack and electric drive system drag test method Download PDFInfo
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- CN112394251A CN112394251A CN202011357288.XA CN202011357288A CN112394251A CN 112394251 A CN112394251 A CN 112394251A CN 202011357288 A CN202011357288 A CN 202011357288A CN 112394251 A CN112394251 A CN 112394251A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
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Abstract
The invention discloses an electric drive system drag rack and an electric drive system drag test method, wherein two test stations for setting an electric drive assembly to be tested are arranged in an environment box, a connection detection part is arranged to be connected with output shafts of the two electric drive assemblies, and a control part controls the two electric drive assemblies to be in an output torque mode and a feed mode respectively so as to test the two electric drive assemblies simultaneously.
Description
Technical Field
The invention belongs to the technical field of electric drive, and particularly relates to an electric drive system counter-dragging rack and an electric drive system counter-dragging test method.
Background
According to the standard requirements of various host factories of automobiles at home and abroad at present, an electric drive system of a new energy automobile needs to pass a high-temperature high-humidity life test, wherein in the high-temperature high-humidity test, the electric drive system needs to output certain power to simulate the real situation. At present, the type of verification test in China can only be implemented on a dual-motor bench, the key components of the type of bench are two dynamometers, only one electric drive system can be made at one time, and the cost is high.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electric drive system counter-dragging rack and an electric drive system counter-dragging test method, so as to solve the problem that the existing electric drive system is expensive in test cost.
In order to solve the problems, the technical scheme of the invention is as follows:
the invention relates to an electric drive system counter-dragging rack which comprises an environment box and a control part;
the environment box is used for controlling the temperature and the humidity of the space in the environment box;
two testing stations and a connection detection part are arranged in the environment box; the two test stations are arranged in parallel and at intervals and used for mounting an electric drive assembly; the connection detection part is arranged between the two testing stations, and two ends of the connection detection part are respectively connected with output shafts of the electric drive assembly at two sides and used for transmitting the rotating speed and the torque between the two output shafts;
the control part is in signal connection with the electric drive assemblies on the two test stations respectively and is used for forming an output torque signal and a feed signal to the two electric drive assemblies respectively so as to enable the two electric drive assemblies to be in an output torque mode and a feed mode respectively; the control part is also in signal connection with the connection detection part and is used for receiving the rotating speed and the torque loaded by the connection detection part.
According to the electric drive system twin trawling rack, the connection detection part is a coupler, and a rotating speed detection device and a torque detection device are mounted on the coupler.
According to the electric drive system counter-dragging rack, the environment box is connected with a temperature and humidity control device through a pipeline and used for adjusting the temperature and humidity in the environment box.
The electric drive system of the invention is to towing the platform, the said control division includes upper computer, first bus, second bus, data acquisition system; the upper computer is respectively in signal connection with the two electric drive assemblies on the test stations through the first bus and the second bus and is used for respectively forming output torque signals and feeding signals to the two electric drive assemblies.
According to the electric drive system of the invention, for the towing rack, the output torque signal comprises torque information and rotating speed information; the feed signal includes torque information.
The invention discloses a method for testing the counter-dragging of an electric drive system, which is applied to any one of the counter-dragging racks of the electric drive system, wherein a first electric drive assembly and a second electric drive assembly are respectively arranged on two testing stations, and the method comprises the following specific steps:
step S1: connecting two ends of the connection detection part with output shafts of the first electric drive assembly and the second electric drive assembly respectively, and locking a differential function of the first electric drive assembly and the second electric drive assembly;
step S2: the control part forms an output torque signal to the first electric drive assembly, and the first electric drive assembly is in an output torque mode and drives the second electric drive assembly to follow the rotation through the connection detection part;
step S3: the control portion forming a feed signal to the second electric drive assembly, the second electric drive assembly being in a feed mode and forming a load torque to balance the output torque;
step S4: the control part controls the first electric drive assembly and the second electric drive assembly to stop after running for a preset time.
The invention relates to a method for testing the drag of an electric drive system, which comprises the following steps:
step S5: the control part forms an output torque signal to the second electric drive assembly, and the second electric drive assembly is in an output torque mode and drives the first electric drive assembly to follow the rotation through the connection detection part;
step S6: the control portion forming a feed signal to the first electric drive assembly, the first electric drive assembly being in a feed mode and forming a load torque to balance the output torque;
step S7: the control part controls the first electric drive assembly and the second electric drive assembly to stop after running for a preset time.
According to the electric drive system drag test method, the feed signal comprises a load torque value, and the load torque value is set according to the rotating speed and the torque loaded by the connection detection part.
According to the electric drive system double-drag test method, the output torque signal comprises an output torque value; the feed signal includes a load torque value, and the output torque value is equal to the sum of the load torque value and a system friction value.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
according to the embodiment of the invention, the two test stations for setting the electric drive assembly to be tested are arranged in the environment box, the connection detection part is arranged to be connected with the output shafts of the two electric drive assemblies, and the control part controls the two electric drive assemblies to be in the output torque mode and the feed mode respectively so as to test the two electric drive assemblies at the same time.
Drawings
FIG. 1 is a schematic view of the electric drive system of the present invention versus a towing carriage.
Detailed Description
The following describes an electric drive system counter-towing rack and an electric drive system counter-towing test method according to the present invention in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Example one
Referring to FIG. 1, in one embodiment, an electric drive system counter-trawling gantry includes an environmental chamber and a control.
The environmental chamber is used for controlling the temperature and humidity of the space in the environmental chamber. Two testing stations and a connection detection part are arranged in the environment box. The two test stations are arranged in parallel and at intervals and used for installing the electric drive assembly. The connection detection part is arranged between the two testing stations, and two ends of the connection detection part are respectively connected with output shafts of the electric drive assemblies on two sides and used for transmitting the rotating speed and the torque between the two output shafts.
The control part is respectively in signal connection with the electric drive assemblies on the two test stations and is used for respectively forming an output torque signal and a feeding signal to the two electric drive assemblies so as to enable the two electric drive assemblies to be in an output torque mode and a feeding mode respectively. The control part is also in signal connection with the connection detection part and is used for receiving the rotating speed and the torque loaded by the connection detection part.
This embodiment is through setting up two test station that are used for setting up the electric drive assembly that awaits measuring in the environment case, and set up the output shaft that connects two electric drive assemblies of detection part connection, be in output torque mode and feed mode respectively by two electric drive assemblies of control division control, test two electric drive assemblies simultaneously, can gather the rotational speed and the torque data that connect detection part to bear simultaneously, but effective application in some middle and low load test scenes of electric drive assembly, avoided current rack to adopt schemes such as gear box or dynamometer, the expense of putting into operation of rack has been reduced, can reduce the experimental expense by a wide margin simultaneously.
Meanwhile, the two electric drive assemblies are arranged in the environment box and do not have any extended part, so that an opening cannot be formed in the environment box, the stability of the temperature and the humidity in the environment box is guaranteed, and the effectiveness of the test is further guaranteed.
In this embodiment, the connection detecting portion may be a coupling, and a rotation speed detecting device and a torque detecting device are mounted on the coupling, and are configured to detect a rotation speed and a torque of the coupling and output the rotation speed and the torque to the control portion. Further, the strength of the coupling needs to meet the torque required by the test.
In this embodiment, there is a temperature and humidity control device in the environment box through the pipe connection for adjust the temperature and humidity in the environment box. The temperature and humidity control device can be an air radiator or an air cooler and is connected with the environment box through a pipeline.
Further, the environment box body can be of a cuboid structure, the interior of the environment box body is hollow, a visual window is arranged on the box body, a water inlet and outlet pipe passage and a high-low voltage cable inlet and outlet passage are reserved, a temperature and humidity sensor is further arranged at the bottom of the box body, the temperature and humidity sensor can be integrally and separately hoisted, and convenience in installation and monitoring of sample pieces is guaranteed.
In this example, the internal dimensions of the environmental chamber are about (L x W x H): 1700mm 1500mm 1100mm, the air cooling device should be as close to the environmental chamber as possible, so that the air passages are as small as possible, ensuring cooling effect.
The relevant parameter design and requirements of the air cooling device are as follows in table 1:
table 1: design of relevant parameters and requirements of air cooling device
In this embodiment, the control unit may specifically include an upper computer, a first bus, a second bus, and a data acquisition system. The upper computer is respectively connected with the electric drive assemblies on the two test stations through the first bus and the second bus in a signal mode and is used for respectively forming an output torque signal and a feed signal to the two electric drive assemblies so as to control the running states of the two electric drive assemblies.
Further, the output torque signal includes torque information and rotational speed information, and the feed signal includes torque information.
The basic design principle of the electric drive system of the embodiment on the pallet is as follows:
the durability test of the electric drive system is designed to verify its life in actual use by an acceleration model. This example was designed for durability testing, with two samples (corresponding to the electric drive assembly) placed in an environmental chamber to simulate the desired environmental conditions, temperature and humidity. The output shafts of the two sample pieces are connected through a coupling. Thus, while one sample is operating in motor mode (i.e., output torque mode), the other is operating in generator mode (i.e., feed mode). In the test process, the switching between the motor mode and the generator mode of the test sample piece can be realized through the software control of the upper computer. Although the bench of the embodiment is adopted for testing, the time ratio of the motor operation mode cannot completely simulate the actual operation condition, in essence, whether the motor operates in a generator or in a motor, and the key for checking the service life of the motor is to see the reliability of the mechanical structure of the motor and the durability of insulation in the operation process. The effect of nearly equal and reverse torques in the operation process of the two motors for towing on the mechanical structure and the effect of heating caused by currents with small difference on insulation can ensure the effectiveness of the durability test on the towing rack by adopting the embodiment.
Example two
The electric drive system opposite-dragging test method of the embodiment is applied to the electric drive system opposite-dragging rack of the first embodiment, and the electric drive system opposite-dragging rack is provided with a first electric drive assembly and a second electric drive assembly which are arranged on two test stations respectively, and the method specifically comprises the following steps:
step S1: connecting two ends of the connection detection part with output shafts of the first electric drive assembly and the second electric drive assembly respectively, and locking the differential function of the first electric drive assembly and the second electric drive assembly; and adjusting the temperature and humidity in the environmental chamber to preset values.
Step S2: the control part forms an output torque signal to the first electric drive assembly, controls the first electric drive assembly to be in an output torque mode and drives the second electric drive assembly to follow rotation through the connection detection part. At the moment, the rotating speed detection device and the torque detection device can feed back the rotating speed and the torque borne by the coupler to the upper computer.
Step S3: the control portion forms a feed signal to the second electric drive assembly, which is in a feed mode and forms a load torque balancing output torque.
Step S4: the control part controls the first electric drive assembly and the second electric drive assembly to stop after running for a preset time.
Step S5: the control part forms an output torque signal to the second electric drive assembly, and the second electric drive assembly is in an output torque mode and drives the first electric drive assembly to follow the rotation through the connection detection part.
Step S6: the control portion forms a feed signal to the first electric drive assembly, which is in a feed mode and forms a load torque balancing output torque.
Step S7: the control part controls the first electric drive assembly and the second electric drive assembly to stop after running for a preset time.
Wherein steps S2-S4 are tests in which the first electric drive assembly is in the output torque mode and the second electric drive assembly is in the feed mode, and steps S3-S4 are reverse tests in which the first electric drive assembly is in the feed mode and the second electric drive assembly is in the output torque mode. The working modes of the two sample pieces are switched through the upper computer, and finally the two sample pieces obtain the same torque mode and the same power generation mode running time.
In this embodiment, the feeding signal includes a load torque value, and the load torque value is set according to the rotation speed and the torque carried by the connection detection portion, that is, a magnitude value required for obtaining the load torque through the obtained torque sleeve on the coupling by using an empirical formula.
In this embodiment, the output torque signal includes an output torque value and the feed signal includes a load torque value, the output torque value being equal to the sum of the load torque value and the system friction value. The upper computer controls the second electric drive assembly to carry out load torque, so that balance is realized between the output torque and the load torque as well as power loss or friction loss generated by the coupler. As a simple example, if the output torque of the first electric drive assembly is 1000 nm, the friction loss generated between the two is minus 50 nm, and the load torque of the second electric drive assembly is minus 950 nm, the balance between the torques of the two electric drive assemblies can be realized, so as to obtain a stable working condition for the test.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (9)
1. The electric drive system counter-dragging rack is characterized by comprising an environment box and a control part;
the environment box is used for controlling the temperature and the humidity of the space in the environment box;
two testing stations and a connection detection part are arranged in the environment box; the two test stations are arranged in parallel and at intervals and used for mounting an electric drive assembly; the connection detection part is arranged between the two testing stations, and two ends of the connection detection part are respectively connected with output shafts of the electric drive assembly at two sides and used for transmitting the rotating speed and the torque between the two output shafts;
the control part is in signal connection with the electric drive assemblies on the two test stations respectively and is used for forming an output torque signal and a feed signal to the two electric drive assemblies respectively so as to enable the two electric drive assemblies to be in an output torque mode and a feed mode respectively; the control part is also in signal connection with the connection detection part and is used for receiving the rotating speed and the torque loaded by the connection detection part.
2. The electric drive system counter-towing carriage as recited in claim 1, wherein said connection detecting portion is a coupling, and said coupling has a rotation speed detecting device and a torque detecting device mounted thereon.
3. The electric drive system counter-towing platform as claimed in claim 1, wherein a temperature and humidity control device is connected to the environment chamber through a pipe for adjusting the temperature and humidity in the environment chamber.
4. The electric drive system counter-towing platform as claimed in claim 1, wherein the control part comprises an upper computer, a first bus, a second bus, a data acquisition system; the upper computer is respectively in signal connection with the two electric drive assemblies on the test stations through the first bus and the second bus and is used for respectively forming output torque signals and feeding signals to the two electric drive assemblies.
5. The electric drive system counter-trawling stand of claim 1, wherein said output torque signal includes torque information and rotational speed information; the feed signal includes torque information.
6. An electric drive system counter-dragging test method is applied to an electric drive system counter-dragging rack according to any one of claims 1-5, wherein a first electric drive assembly and a second electric drive assembly are respectively arranged on two test stations, and the specific steps comprise:
step S1: connecting two ends of the connection detection part with output shafts of the first electric drive assembly and the second electric drive assembly respectively, and locking a differential function of the first electric drive assembly and the second electric drive assembly;
step S2: the control part forms an output torque signal to the first electric drive assembly, and the first electric drive assembly is in an output torque mode and drives the second electric drive assembly to follow the rotation through the connection detection part;
step S3: the control portion forming a feed signal to the second electric drive assembly, the second electric drive assembly being in a feed mode and forming a load torque to balance the output torque;
step S4: the control part controls the first electric drive assembly and the second electric drive assembly to stop after running for a preset time.
7. The electric drive system drag test method of claim 6, further comprising the steps of:
step S5: the control part forms an output torque signal to the second electric drive assembly, and the second electric drive assembly is in an output torque mode and drives the first electric drive assembly to follow the rotation through the connection detection part;
step S6: the control portion forming a feed signal to the first electric drive assembly, the first electric drive assembly being in a feed mode and forming a load torque to balance the output torque;
step S7: the control part controls the first electric drive assembly and the second electric drive assembly to stop after running for a preset time.
8. The electric drive system split test method as set forth in claim 6, wherein said feed signal comprises a load torque value, said load torque value being set in accordance with a rotational speed and a torque carried by said connection detection portion.
9. The electric drive system split test method as recited in claim 6, wherein said output torque signal comprises an output torque value; the feed signal includes a load torque value, and the output torque value is equal to the sum of the load torque value and a system friction value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011357288.XA CN112394251A (en) | 2020-11-27 | 2020-11-27 | Electric drive system drag rack and electric drive system drag test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011357288.XA CN112394251A (en) | 2020-11-27 | 2020-11-27 | Electric drive system drag rack and electric drive system drag test method |
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| CN112394251A true CN112394251A (en) | 2021-02-23 |
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| CN202011357288.XA Pending CN112394251A (en) | 2020-11-27 | 2020-11-27 | Electric drive system drag rack and electric drive system drag test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114994533A (en) * | 2022-08-04 | 2022-09-02 | 深圳众城卓越科技有限公司 | Automatic loading test system and test method for twin-towed unit |
-
2020
- 2020-11-27 CN CN202011357288.XA patent/CN112394251A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114994533A (en) * | 2022-08-04 | 2022-09-02 | 深圳众城卓越科技有限公司 | Automatic loading test system and test method for twin-towed unit |
| CN114994533B (en) * | 2022-08-04 | 2022-11-01 | 深圳众城卓越科技有限公司 | Automatic loading test system and test method for twin-towed unit |
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