Electric drive no-load detection device and detection method

Abstract

The present invention provides an electric drive no-load detection device and a detection method, and relates to the field of electric drive manufacturing technology. The electric drive no-load detection device includes: a load-bearing platform, the load-bearing platform is used to carry the target electric drive, and the target electric drive has an electronic control unit; an acquisition module, the acquisition module is electrically connected to the target electric drive, and the acquisition module is used to acquire the audio signal when the target electric drive is in the target working condition; a control module, the control module is electrically connected to the target electric drive and the acquisition module, and the acquisition module transmits the acquired audio signal to the control module through a signal transmission harness; the control module drives the target electric drive to operate in the target working condition through the electronic control unit, and the control module generates judgment result information based on the audio signal, and the judgment result information at least includes whether the target electric drive burr audio is normal and the target electric drive burr audio is abnormal. This solution can be combined with audio software to automatically analyze the burr audio to determine whether it is abnormal, and has strong practicality and economy.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drive manufacturing, and in particular to an electric drive no-load detection device and a detection method. Background Art

[0002] In the prior art, electric drives undergo EOL testing before leaving the factory and being completed as a vehicle. However, it is difficult to intercept burr alarms during EOL testing, and the electric drive usually needs to be disassembled for inspection, which is inefficient and results in scrapped parts. If the electric drive is released directly, poor outflow may occur, and it will be discovered too late during a vehicle road test, resulting in higher repair costs for the vehicle.

[0003] Currently, no effective solution has been proposed for the above-mentioned technical problems. Summary of the invention

[0004] The main purpose of the present invention is to provide an electric drive no-load detection device and a detection method to solve the problems of low efficiency and high cost of electric drive NVH detection in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an electric drive no-load detection device, comprising: a load platform, the load platform is used to carry a target electric drive, the target electric drive has an electronic control unit; an acquisition module, the acquisition module is electrically connected to the target electric drive, the acquisition module is used to acquire an audio signal when the target electric drive is in a target operating condition, wherein the audio signal includes at least one of a noise signal, a vibration signal, and a roughness signal of the target electric drive, and the target operating condition includes at least one of a starting condition, an acceleration condition, a constant high-speed condition, a deceleration condition, and a braking condition; a control module, the control module is electrically connected to the target electric drive and the acquisition module, the acquisition module transmits the acquired audio signal to the control module through a signal transmission harness; the control module drives the target electric drive to operate in the target operating condition through the electronic control unit, and the control module generates judgment result information based on the audio signal, the judgment result information includes at least whether the target electric drive burr audio is normal and whether the target electric drive burr audio is abnormal.

[0006] Furthermore, the control module includes a display unit, and the display unit is used to display the judgment result information.

[0007] Furthermore, the electric drive no-load detection device also includes an industrial PC, there are multiple industrial PCs, the industrial PCs are arranged between the control module and the acquisition module, and / or, the industrial PCs are arranged between the target electric drive and the control module, and / or, the industrial PCs are arranged between the target electric drive and the acquisition module, and the industrial PCs are used to store and process the audio signals.

[0008] Furthermore, the control module has a CAN card, which is connected to the electronic control unit via a signal transmission harness, and the CAN card is used to send control instructions to the electronic control unit.

[0009] Furthermore, the electric drive no-load detection device also includes a power management module, which is connected to an external power supply, and the power management module includes: a low-voltage power supply module, the input end of the low-voltage power supply module is connected to the control module through a signal transmission harness, and the output end of the low-voltage power supply module is connected to the low-voltage interface of the target electric drive through a low-voltage harness; a high-voltage power supply module, the input end of the high-voltage power supply module is connected to the control module through a signal transmission harness, and the output end of the high-voltage power supply module is connected to the high-voltage interface of the target electric drive through a high-voltage harness; wherein, the low-voltage power supply module is used to provide low-voltage control power supply to the electronic control unit, and the high-voltage power supply module is used to provide high-voltage drive power supply to the target electric drive.

[0010] Furthermore, the control module includes: an analog-to-digital converter, which is connected to the acquisition module and the power management module through a signal transmission harness, and is used to convert electrical signals into digital signals; an output unit, which is used to generate judgment result information based on the digital signal output by the analog-to-digital converter.

[0011] Furthermore, the control module also includes: an input unit, the input unit is connected to the CAN card, and the input unit is used to input control instructions.

[0012] Furthermore, the acquisition module includes: a noise reduction microphone, which is arranged close to the target electric drive, and the output end of the noise reduction microphone is connected to the analog-to-digital converter, and the noise reduction microphone is used to collect noise when the target electric drive is running at no load, and the noise reduction microphone converts the noise signal and the roughness signal into electrical signals; a vibration sensor, the input end of the vibration sensor is connected to the target electric drive, the output end of the vibration sensor is connected to the analog-to-digital converter, and the vibration sensor is used to convert the vibration signal into an electrical signal.

[0013] Furthermore, the target electric drive also has a speed loop, which is connected to an electronic control unit. The electronic control unit controls the speed loop to change the speed of the target electric drive based on different control instructions.

[0014] According to another aspect of the present invention, there is provided an electric drive no-load detection method, which is based on the above-mentioned electric drive no-load detection device for detection, and comprises the following steps: connecting a target electric drive to the electric drive no-load detection device, driving the target electric drive to operate under a preset operating condition, wherein the preset operating condition at least includes one of a starting condition, an acceleration condition, a constant high-speed condition, a deceleration condition, and a braking condition; acquiring an audio signal when the target electric drive operates under the preset operating condition, wherein the audio signal at least includes one of a noise signal, a vibration signal, and a roughness signal; and generating a judgment result based on the audio signal.

[0015] By applying the technical solution of the present invention, the no-load noise under different target electric drive working conditions is collected by the acquisition module to obtain an audio signal, and then the audio signal is transmitted to the control module. The control module compares the audio signal with the audio data stored in itself, and automatically analyzes whether the glitch audio is abnormal, so as to identify the EOL glitch working condition, and feedback the NVH (noise, vibration, and harshness) of the electric drive. The results of the analysis and judgment are fed back to the staff, and the target electric drive that does not meet the glitch working condition requirements is intercepted, thereby realizing the automation of the electric drive EOL offline test, without the need to disassemble the motor for manual inspection, saving manpower and material resources, and improving the detection efficiency, which has strong practicality and economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 It shows a schematic structural diagram of a first embodiment of an electric drive no-load detection device according to the present invention;

[0018] Figure 2 A structural schematic diagram of a second embodiment of an electric drive no-load detection device according to the present invention is shown.

[0019] The above drawings include the following reference numerals:

[0020] 1. Testing bench;

[0021] 2. Control module; 21. Analog-to-digital converter;

[0022] 3. CAN card;

[0023] 4. Low voltage power module;

[0024] 5. High voltage power module;

[0025] 6. High voltage wiring harness;

[0026] 7. Low voltage wiring harness;

[0027] 8. Collection module;

[0028] 9. Target electric drive;

[0029] 10. Carrying platform. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0034] First, some nouns or terms that appear in the description of the prior art and the embodiments of the present application are subject to the following explanations:

[0035] Electric drive NVH: Noise Vibration Harshness, that is, the noise, vibration and roughness of the electric drive. Electric drive NVH is a comprehensive indicator to measure the ride comfort and noise control level of the vehicle during driving.

[0036] CAN card: Controller Area Network, an interface card used to implement CAN bus communication, which can be connected to the control unit for data signal transmission.

[0037] Industrial PC: Industrial Personal Computer, a computer system used in industrial environments. It is set up in an industrial environment to store, process and transmit signals collected in the industrial environment.

[0038] Combination Figure 1 to Figure 2 As shown, according to a specific embodiment of the present application, an electric drive no-load detection device is provided.

[0039] Specifically, Figure 2 As shown, the electric drive no-load detection device includes a carrier 10, a collection module 8 and a control module 2, the carrier 10 is used to carry the target electric drive 9, and the target electric drive 9 has an electronic control unit; the collection module 8 is electrically connected to the target electric drive 9, and the collection module 8 is used to collect audio signals when the target electric drive 9 is in a target operating condition, wherein the audio signal includes at least one of a noise signal, a vibration signal, and a roughness signal of the target electric drive 9, and the target operating condition includes at least one of a starting condition, an acceleration condition, a constant high-speed condition, a deceleration condition, and a braking condition; the control module 2 is electrically connected to the target electric drive 9 and the collection module 8, and the collection module 8 transmits the collected audio signal to the control module 2 through a signal transmission harness; the control module 2 drives the target electric drive 9 to operate in the target operating condition through the electronic control unit, and the control module 2 generates judgment result information based on the audio signal, and the judgment result information includes at least whether the target electric drive burr audio is normal and whether the target electric drive burr audio is abnormal.

[0040] By applying the technical solution of this embodiment, the no-load noise of the target electric drive 9 under different working conditions is collected by the acquisition module 8 to obtain an audio signal, and then the audio signal is transmitted to the control module 2. The control module 2 compares the audio signal with the audio data stored in itself, and automatically analyzes whether the glitch audio is abnormal, so as to identify the EOL glitch working condition, and feedback the NVH (noise, vibration, and harshness) of the electric drive. The results of the analysis and judgment are fed back to the staff, and the target electric drive 9 that does not meet the glitch working condition requirements is intercepted, thereby realizing the automation of the electric drive EOL offline test, without the need to disassemble the motor for manual inspection, saving manpower and material resources, and improving detection efficiency, which has strong practicality and economic value.

[0041] It should be noted that the target electric drive 9 can operate in any target working condition and can switch working conditions between various target working conditions. The acquisition module 8 can collect noise signals, vibration signals and roughness signals when the target electric drive 9 is in various target working conditions and transmit the signal data to the control module 2. In this embodiment, the target electric drive 9 is set to a detection mode for periodically switching the target working condition, that is, the speed of the target electric drive 9 is 0→3000rpm→0 no-load operation for 30 seconds as a cycle. In a no-load operation cycle, the target electric drive 9 switches between the starting working condition, the acceleration working condition, the constant high-speed working condition, the deceleration working condition and the braking working condition. In this way, the operating state of the target electric drive 9 under different working conditions can be fully detected to ensure that the target electric drive 9 can meet the expected performance standards under various operating conditions.

[0042] Specifically, Figure 2 As shown, the control module 2 includes a display unit, which is used to display the judgment result information. By setting the display unit in the control module 2, the detection result can be intuitively presented to the operator, which is convenient for quickly identifying the operating state of the target electric drive 9, or automatically judging according to the detection result, automatically recording the target electric drive 9 that does not meet the requirements, and the operator judges whether the target electric drive 9 is qualified according to the information of the display unit, and then takes corresponding treatment measures.

[0043] It should be noted that the target electric drive glitch audio abnormality includes abnormal electric drive noise, abnormal electric drive vibration, and abnormal electric drive roughness. The display unit displays the normal target electric drive glitch audio and abnormal target electric drive glitch audio results of the target electric drive 9, and the display unit is not limited to simply displaying the judgment result information. It can also compare and analyze the audio signal data with the audio data stored in its own software according to the control module 2, so as to help operators and engineers better understand the status of the target electric drive 9 through analysis reports or trend charts, and provide ideas for the repair and optimization of the target electric drive 9, thereby improving the reliability and life of the target electric drive 9, and also improving the automation and intelligence level of the electric drive no-load detection device.

[0044] Furthermore, the electric drive no-load detection device also includes an industrial PC, there are multiple industrial PCs, the industrial PCs are arranged between the control module 2 and the acquisition module 8, and / or, the industrial PCs are arranged between the target electric drive 9 and the control module 2, and / or, the industrial PCs are arranged between the target electric drive 9 and the acquisition module 8, and the industrial PCs are used to store and process the audio signals. During the long-term operation test of the target electric drive 9, in addition to performing data processing and transmission tasks, the industrial PC can also continuously record the operating status of the target electric drive 9, that is, the industrial PC further processes the data in depth, realizes refined management of the performance of the target electric drive 9, and provides data support for performance optimization and fault analysis of the target electric drive 9.

[0045] In one embodiment of the present application, industrial PCs are arranged between the control module 2 and the acquisition module 8, between the control module 2 and the target electric drive 9, and between the acquisition module 8 and the target electric drive 9. The two industrial PCs connected to the target electric drive 9 can record and analyze the operating status of the target electric drive 9, and the two industrial PCs connected to the acquisition module 8 can process, store and transmit the collected data of the target electric drive 9. The two industrial PCs connected to the control module 2 can transmit data signals to the control module 2, and transmit the control command signals issued by the control module 2 to the acquisition module 8 and the target electric drive 9.

[0046] In another embodiment of the present application, an industrial PC is set only between the control module 2 and the acquisition module 8, and between the control module 2 and the target electric drive 9, that is, only two industrial PCs connected to the control module 2 are set to realize the transmission of audio signals to the control module 2 and the transmission of control information to the acquisition module 8 and the target electric drive 9, thereby eliminating the first level of industrial PC for processing and storing audio signals collected by the target electric drive 9. The acquisition module 8 transmits the collected audio signals directly to the industrial PC or directly to the control module 2, thereby reducing the complexity and cost of the circuit.

[0047] Furthermore, if Figure 1 , Figure 2 As shown, the control module 2 has a CAN card 3, which is connected to the electronic control unit through a signal transmission harness, and the CAN card 3 is used to send control instructions to the electronic control unit. The CAN card 3 can realize efficient and accurate communication between the control module 2 and the control unit of the target electric drive 9, ensuring the accurate execution of the control instructions issued by the control module 2. During the dynamic test of the target electric drive 9, the CAN card 3 can respond quickly and quickly transmit the control instructions to the electronic control unit, so as to realize the start-stop switching of the operating condition of the target electric drive 9 through the control module 2, thereby improving the accuracy and efficiency of the test.

[0048] Furthermore, if Figure 1As shown, the electric drive no-load detection device also includes a power management module, which is connected to an external power supply. The power management module includes: a low-voltage power module 4 and a high-voltage power module 5. The input end of the low-voltage power module 4 is connected to the control module 2 through a signal transmission harness, and the output end of the low-voltage power module 4 is connected to the low-voltage interface of the target electric drive 9 through a low-voltage harness 7; the input end of the high-voltage power module 5 is connected to the control module 2 through a signal transmission harness, and the output end of the high-voltage power module 5 is connected to the high-voltage interface of the target electric drive 9 through a high-voltage harness 6; wherein, the low-voltage power module 4 is used to provide low-voltage control power supply to the electronic control unit, and the high-voltage power module 5 is used to provide high-voltage drive power supply to the target electric drive 9. The setting of the power management module can ensure the stable power supply of the target electric drive 9 during the test. Through the clear division of labor between the low-voltage power supply module 4 and the high-voltage power supply module 5, the low-voltage control of the electronic control unit and the high-voltage drive of the target electric drive 9 are respectively satisfied. The low-voltage power supply module 4 adopts a low-voltage wiring harness 7 for low-voltage current transmission, and the high-voltage power supply module 5 adopts a high-voltage wiring harness 6 for high-voltage current transmission. The low-voltage wiring harness 7 and the high-voltage wiring harness 6 are separately arranged to avoid mutual interference between high-voltage electricity and low-voltage electricity, which can effectively avoid test errors caused by power supply fluctuations and improve the safety and stability of the test.

[0049] It should be noted that the power management module is connected to the external power supply to not only provide control power and drive power to the target electric drive 9, but also ensure the power supply to the entire electric drive no-load detection device, such as the power supply to the acquisition module 8 and the control module 2.

[0050] Furthermore, if Figure 1 As shown, the control module 2 includes an analog-to-digital converter 21 and an output unit. The analog-to-digital converter 21 is connected to the acquisition module 8 and the power management module through a signal transmission harness. The analog-to-digital converter 21 is used to convert an electrical signal into a digital signal; the output unit is used to generate judgment result information based on the digital signal output by the analog-to-digital converter 21. The acquisition module 8 stores and transmits the audio signal collected from the target electric drive 9 in the form of an electrical signal. The electrical signal is a relatively common signal in electrical components, and has the characteristics of being easy to obtain and easy to transmit along the signal transmission harness. The acquisition module 8 transmits the collected audio signal in the form of an electrical signal to the control module, and converts the electrical signal into a digital signal through the analog-to-digital converter 21. Based on the characteristics of digital signals that are easy to store and edit, the audio signal can be stored and processed in the form of a digital signal, thereby improving data compatibility and integration, and also facilitating the automation and intelligence of signal control, and realizing the intelligence of displaying and operating the judgment result information, thereby improving the efficiency and accuracy of data processing.

[0051] In one embodiment of the present application, complex audio information of the target electric drive 9 is converted into clear digital information, so that the audio signal can be accurately analyzed and interpreted, which effectively improves the feedback on the status of the target electric drive 9 and facilitates the operator to analyze the status of the target electric drive 9.

[0052] Specifically, the control module 2 also includes an input unit, which is connected to the CAN card 3 and is used to input control instructions. The input unit provides a human-computer interaction interface for the operator through the display unit, making the input of the control instruction more intuitive and convenient, that is, the operator can input a preset operation instruction to the control module 2 through the input unit, and the control module 2 controls the electric drive no-load detection device to perform corresponding actions based on the preset operation instruction. For example, during the test of the target electric drive 9, the operator can adjust the operating parameters of the target electric drive 9 through the input unit to adjust the operating condition of the target electric drive 9, thereby improving the flexibility and efficiency of the test.

[0053] It should be noted that the input unit in the control module 2 is connected to the CAN card 3. After receiving the control instruction from the input unit, the control module 2 can send the control instruction to the electronic control unit through the CAN card 3, and the electronic control unit then performs corresponding actions according to the control instruction.

[0054] Further, the acquisition module 8 includes a noise reduction microphone and a vibration sensor. The noise reduction microphone is arranged near the target electric drive 9. The output end of the noise reduction microphone is connected to the analog-to-digital converter 21. The noise reduction microphone is used to collect the noise of the target electric drive 9 when it is running without load, and the noise reduction microphone converts the noise signal and the roughness signal into an electrical signal. The input end of the vibration sensor is connected to the target electric drive 9, and the output end of the vibration sensor is connected to the analog-to-digital converter 21. The vibration sensor is used to convert the vibration signal into an electrical signal. The noise reduction microphone can collect the noise signal and the roughness signal of the target electric drive 9, and the vibration sensor can collect the vibration signal of the target electric drive 9. In this embodiment, the noise reduction microphone is arranged near the target electric drive 9, and the vibration sensor is connected to the shell of the target electric drive 9. Through the combined use of the noise reduction microphone and the vibration sensor, the noise and vibration information of the target electric drive 9 during operation can be fully collected, and the accuracy and reliability of signal acquisition can be improved. In the test of the target electric drive 9, by comparing with the information stored by itself, the abnormal state of the target electric drive 9 can be effectively identified.

[0055] Furthermore, the target electric drive 9 also has a speed loop, which is connected to the electronic control unit. The electronic control unit controls the speed loop to change the speed of the target electric drive 9 based on different control instructions. The speed loop can control the speed of the target electric drive 9 to run at a preset speed, that is, under the control of the control module 2, simulate various working conditions of the target electric drive 9. After the speed loop electronic control is turned on, the control module 2 can be allowed to directly control the speed of the target electric drive 9. Usually, the speed feedback control is released in the closed-loop control, and the operating state of the target electric drive 9 is directly set by the control instruction.

[0056] In one embodiment of the present application, Figure 2 As shown, the electric drive no-load detection device also has a detection bench 1, and the control module 2 is a host computer. The detection bench 1 is used to carry the host computer and the power management module, and integrate them on the detection bench 1. The detection bench 1 can provide a controlled test environment for the target electric drive 9 to ensure the accuracy and repeatability of the test and reduce external interference (external vibration, noise).

[0057] According to another specific embodiment of the present application, an electric drive no-load detection method is also provided. The method is based on the electric drive no-load detection device in the above embodiment for detection, and the method includes the following steps:

[0058] S10: connecting the target electric drive to the electric drive no-load detection device, and driving the target electric drive to operate under a preset working condition, wherein the preset working condition includes at least one of a starting working condition, an acceleration working condition, a constant high speed working condition, a deceleration working condition, and a braking working condition;

[0059] Specifically, the preset operating conditions are distinguished and represented by different speeds, speed change degrees, torques, speed change times and stabilization times of the target electric drive. Based on different settings of the above parameters, various operating conditions of the preset operating conditions of the target electric drive can be simulated.

[0060] S20: Acquire an audio signal when the target electric drive operates under a preset working condition, where the audio signal includes at least one of a noise signal, a vibration signal, and a roughness signal;

[0061] Specifically, the audio signal corresponding to each preset working condition can be represented by the noise signal, vibration signal and roughness signal of the target electric drive, and the performance of the target electric drive and whether there are abnormal conditions of noise, vibration and roughness can be judged through the audio signal.

[0062] S30: Generate a judgment result based on the audio signal.

[0063] Specifically, the judgment result is generated by comparing the audio signal with the audio signal stored in the electric drive no-load detection device, and the judgment result includes that the target electric drive burr audio is normal, the target electric drive burr noise is abnormal, the target electric drive burr vibration is abnormal, and the target electric drive roughness is abnormal.

[0064] Applying the technical solution of this embodiment, the target electric drive is connected to the electric drive no-load detection device, and the target electric drive is driven to operate under a preset working condition, which includes at least one of a starting condition, an acceleration condition, a constant high-speed condition, a deceleration condition, and a braking condition; an audio signal when the target electric drive is operating under a preset working condition is obtained, and the audio signal includes at least one of a noise signal, a vibration signal, and a roughness signal; based on the audio signal, a judgment result is generated. This method can not only detect the performance of the target electric drive under static conditions, but also comprehensively evaluate the state of the target electric drive during dynamic operation, simulate the vehicle complaint conditions (low speed, small torque, slow acceleration and coasting) including the starting, acceleration, uniform speed, deceleration and braking stages, collect the target electric drive no-load operation noise through the acquisition component, automatically analyze the burr audio and determine whether there is an abnormality, and identify whether the EOL burr condition interception component can be released.

[0065] The detection method and principle of the electric drive no-load detection method for the target electric drive are as follows:

[0066] Step 1: Start the electric drive no-load detection system, input and determine the preset working condition parameters of the target electric drive through the input unit, and generate a control instruction;

[0067] Step 2: The control module transmits the control command to the electronic control unit through the CAN card based on the control command;

[0068] Step 3: The electronic control unit controls the speed loop, thereby driving the target electric drive to rotate in a preset working condition and switching the preset working condition based on the control command;

[0069] Step 4: The acquisition module acquires the audio signals under various working conditions of the target electric drive and transmits the audio signals to the control module;

[0070] Step 5: The control module converts the received audio signal into a data signal, and compares it with the audio data in the audio software stored in its own built-in storage to perform data analysis and judgment;

[0071] Step 6: The control module feeds back the judgment result through the display unit and stores the data information.

[0072] The parameters of the preset working conditions are input through the input unit to generate control instructions. The parameters of the preset working conditions include the speed, torque, speed change time and speed maintenance time of the electric drive. Different working conditions of the target electric drive can be preset. Multiple working conditions of the target electric drive can also be simulated at one time by presetting the changes of each parameter within a cycle.

[0073] The specific simulation settings for the five operating conditions of the target electric drive, namely starting, acceleration, constant speed, deceleration, and braking, are as follows:

[0074] Starting and accelerating conditions: the speed changes from 0→3000rpm, the torque is less than 2Nm, and the change time is 6s;

[0075] Constant high-speed working condition: the speed is maintained at 3000rpm, the torque is less than 2Nm, and the maintenance time is 8s;

[0076] Deceleration and coasting condition: the speed is maintained at 3000rpm, the torque is ≥-2Nm, and the change time is 2s;

[0077] High-speed gliding and light braking conditions: speed maintained at 3000rpm, torque ≥ -2Nm, and maintained for 8s;

[0078] Deceleration and braking conditions: speed from 3000rpm→0, torque ≥-2Nm, change time 6s.

[0079] By setting the above parameters and parameter changes as a cycle for target electric drive detection, the working status of the target electric drive under various working conditions can be detected in 30 seconds. In particular, the simulation of high-incidence scenarios of electric drive NVH problems at low speed, small torque and speed changes can accurately identify the NVH defects of the electric drive, thereby intercepting defective parts in EOL testing to prevent them from flowing into the next production link or market, thereby improving product quality.

[0080] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0081] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0082] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric drive no-load detection device, characterized in that: include: A carrying platform (10), the carrying platform (10) being used to carry a target electric drive (9), the target electric drive (9) having an electric control unit; A collection module (8), the collection module (8) being electrically connected to the target electric drive (9), the collection module (8) being used to collect an audio signal when the target electric drive (9) is in a target operating condition, wherein the audio signal comprises at least one of a noise signal, a vibration signal, and a roughness signal of the target electric drive (9), and the target operating condition comprises at least one of a starting operating condition, an acceleration operating condition, a constant high speed operating condition, a deceleration operating condition, and a braking operating condition; A control module (2), the control module (2) being electrically connected to the target electric drive (9) and the acquisition module (8), the acquisition module (8) transmitting the acquired audio signal to the control module (2) via a signal transmission harness; The control module (2) drives the target electric drive (9) to operate in the target operating condition through the electric control unit, and the control module (2) generates judgment result information based on the audio signal, the judgment result information at least including whether the target electric drive glitch audio is normal and whether the target electric drive glitch audio is abnormal.

2. The electric drive no-load detection device according to claim 1, characterized in that: The control module (2) comprises a display unit, and the display unit is used to display the judgment result information.

3. The electric drive no-load detection device according to any one of claims 1 or 2, characterized in that: The electric drive no-load detection device also includes an industrial PC, wherein there are multiple industrial PCs, and the industrial PCs are arranged between the control module (2) and the acquisition module (8), and / or the industrial PCs are arranged between the target electric drive (9) and the control module (2), and / or the industrial PCs are arranged between the target electric drive (9) and the acquisition module (8), and the industrial PCs are used to store and process the audio signals.

4. The electric drive no-load detection device according to claim 1, characterized in that: The control module (2) has a CAN card (3), the CAN card (3) is connected to the electronic control unit via the signal transmission harness, and the CAN card (3) is used to send control instructions to the electronic control unit.

5. The electric drive no-load detection device according to claim 4, characterized in that: The electric drive no-load detection device further includes a power management module, which is connected to an external power supply and includes: A low-voltage power supply module (4), wherein an input end of the low-voltage power supply module (4) is connected to the control module (2) via the signal transmission harness, and an output end of the low-voltage power supply module (4) is connected to a low-voltage interface of the target electric drive (9) via a low-voltage harness (7); A high-voltage power supply module (5), wherein an input end of the high-voltage power supply module (5) is connected to the control module (2) via the signal transmission harness, and an output end of the high-voltage power supply module (5) is connected to a high-voltage interface of the target electric drive (9) via a high-voltage harness (6); The low-voltage power supply module (4) is used to provide low-voltage control power to the electric control unit, and the high-voltage power supply module (5) is used to provide high-voltage drive power to the target electric drive (9).

6. The electric drive no-load detection device according to claim 5, characterized in that: The control module (2) comprises: an analog-to-digital converter (21), the analog-to-digital converter (21) being connected to the acquisition module (8) and the power management module via the signal transmission harness, the analog-to-digital converter (21) being used to convert the electrical signal into a digital signal; An output unit, the output unit is used to generate the judgment result information based on the digital signal output by the analog-to-digital converter (21).

7. The electric drive no-load detection device according to claim 6, characterized in that: The control module (2) further comprises: An input unit, the input unit is connected to the CAN card (3), and the input unit is used to input the control instruction.

8. The electric drive no-load detection device according to claim 6, characterized in that: The acquisition module (8) comprises: a noise reduction microphone, the noise reduction microphone being arranged close to the target electric drive (9), the output end of the noise reduction microphone being connected to the analog-to-digital converter (21), the noise reduction microphone being used to collect noise when the target electric drive (9) is running at no load, and the noise reduction microphone converting the noise signal and the roughness signal into electrical signals; A vibration sensor, wherein an input end of the vibration sensor is connected to the target electric drive (9), an output end of the vibration sensor is connected to the analog-to-digital converter (21), and the vibration sensor is used to convert the vibration signal into an electrical signal.

9. The electric drive no-load detection device according to claim 4, characterized in that: The target electric drive (9) further comprises a speed loop, wherein the speed loop is connected to the electronic control unit, and the electronic control unit controls the speed loop to change the speed of the target electric drive (9) based on different control instructions.

10. An electric drive no-load detection method, characterized in that: The method is based on the electric drive no-load detection device according to any one of claims 1 to 9 for detection, and the method comprises the following steps: Connecting the target electric drive to the electric drive no-load detection device, driving the target electric drive to operate under a preset working condition, wherein the preset working condition includes at least one of a starting working condition, an acceleration working condition, a constant high speed working condition, a deceleration working condition, and a braking working condition; Acquire an audio signal when the target electric drive operates in the preset working condition, wherein the audio signal includes at least one of a noise signal, a vibration signal, and a roughness signal; Based on the audio signal, the determination result is generated.

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