Vehicle NVH (Noise Vibration and Harshness) performance diagnosis equipment

Abstract

The utility model provides a vehicle NVH performance diagnosis device, comprising a signal acquisition module used for acquiring a vibration signal of a device to be tested; the preprocessing module is connected with the output end of the signal acquisition module and is used for receiving and preprocessing the vibration signal; the diagnosis module is connected with the output end of the preprocessing module and used for receiving the preprocessed vibration signal and outputting a diagnosis report; and the visualization module is connected with the output end of the diagnosis module and is used for visually displaying the diagnosis report. By integrating the signal acquisition module, the preprocessing module, the diagnosis module and the visualization module, one-button diagnosis of the NVH performance is realized, and the problem of high data acquisition difficulty is solved, so that the accuracy and efficiency of NVH performance diagnosis are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle diagnosis technical field, concretely relates to a vehicle NVH performance diagnosis device. BACKGROUND

[0002] With the rapid development of the automobile market, vehicles not only need to meet the basic driving performance requirements, but also need to provide higher standards in user experience. Among them, the NVH (Noise, Vibration and Harshness) performance of the whole vehicle is an important indicator to measure the quality of vehicle products, and is also directly related to user experience. Vehicle manufacturers take NVH performance as one of the core competencies, and with the intensification of market competition, the requirements for the whole vehicle NVH performance are also constantly improved.

[0003] In related technologies, such as traditional internal combustion engine vehicles, the internal combustion engine may have complex noise sources, and in electric vehicles, factors such as motors and reducers can also cause different NVH problems. As a result, the industry is also developing vehicle NVH diagnosis technology to detect and eliminate the impact of these noise and vibration sources on driving experience. However, there are still some deficiencies in the diagnosis equipment for vehicle NVH performance, especially the high threshold of use and the difficulty of data acquisition, which makes the diagnosis accuracy and efficiency of NVH performance low. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the utility model provides a vehicle NVH performance diagnosis device to solve the technical problem of low diagnosis accuracy and efficiency of vehicle NVH performance in the prior art.

[0005] In the first aspect, the utility model provides a vehicle NVH performance diagnosis device, which comprises: a signal acquisition module for acquiring the vibration signal of the device to be tested; a preprocessing module connected to the output end of the signal acquisition module for receiving and preprocessing the vibration signal; a diagnosis module connected to the output end of the preprocessing module for receiving the preprocessed vibration signal and outputting a diagnosis report; and a visualization module connected to the output end of the diagnosis module for visualizing and displaying the diagnosis report.

[0006] In an embodiment of the utility model, signal acquisition module includes sensing signal acquisition unit and CAN bus signal acquisition unit, sensing signal acquisition unit includes a plurality of sensor interface, a plurality of sensor interface includes knock sensor interface, knock sensor interface is used for connecting knock sensor, receives the vibration signal of the device to be measured, CAN bus signal acquisition unit includes CAN transceiver, CAN controller and a plurality of CAN bus interface, CAN bus interface is used for connecting CAN bus and receiving CAN signal, CAN transceiver is used for receiving the CAN signal and output corresponding digital signal, CAN controller is used for receiving the digital signal and output motor speed signal and torque signal.

[0007] In an embodiment of the utility model, the preprocessing module includes analog signal processing unit, analog-to-digital conversion unit and time axis synchronization unit connected in sequence, the analog signal processing unit includes filter circuit, amplification circuit and anti-aliasing filter circuit, the filter circuit is used for filtering processing the vibration signal, the amplification circuit is used for signal amplification processing the vibration signal, and the anti-aliasing filter circuit is used for anti-aliasing filtering processing the vibration signal, the analog-to-digital conversion unit includes 16-bit analog-to-digital converter, the 16-bit analog-to-digital converter is used for analog-to-digital conversion of the vibration signal processed by the analog signal processing unit, and the time axis synchronization unit includes time synchronization circuit, and the time synchronization circuit is used for time axis synchronization of the speed signal, the torque signal and the vibration signal processed by the analog-to-digital conversion unit.

[0008] In an embodiment of the utility model, the filter circuit, the amplification circuit and the anti-aliasing filter circuit all adopt shielded cable.

[0009] In an embodiment of the utility model, the diagnostic module includes order analyzer and central processing unit, the order analyzer is used for receiving the vibration signal and the speed signal after preprocessing and outputting order spectrum, and the central processing unit is used for receiving the order spectrum and outputting the diagnostic report according to the order spectrum and the standard order spectrum corresponding to the torque signal after preprocessing.

[0010] In an embodiment of the utility model, the visualization module includes user interaction interface, the user interaction interface includes touch display screen and function control configured on the touch display screen, the touch display screen is provided with display area, and the diagnostic report is visually displayed through the display area, and the function control includes signal configuration control, process control, data management control, data export control, audio playback control and display adjustment control.

[0011] In an embodiment of the utility model, the device further includes a data export module connected to the output end of the diagnosis module, the data export module includes a wired transmission unit and a wireless transmission unit, the wired transmission unit is configured with a universal serial bus interface and a network interface, the wireless transmission unit is configured with a wireless communication protocol, and the data export module exports the diagnosis report through at least one of the universal serial bus interface, the network interface and the wireless communication protocol.

[0012] In an embodiment of the utility model, the device further includes an audio output module connected to the output end of the preprocessing module, the audio output module includes a player, a loudspeaker and a headphone interface for playing the vibration signal.

[0013] In an embodiment of the utility model, the device further includes a heat dissipation port for discharging heat generated by the device during the diagnosis of the vehicle NVH performance.

[0014] In an embodiment of the utility model, the device further includes a power module, the power module includes: a power interface for connecting a power supply; a power switch for controlling the on-off of the power supply circuit; a DC-DC voltage reduction unit for reducing the voltage of the power supply.

[0015] The utility model has the advantages of:

[0016] The device includes a signal acquisition module, a preprocessing module, a diagnosis module and a visualization module, wherein the signal acquisition module is used for acquiring the vibration signal of a device to be tested, the preprocessing module is connected to the output end of the signal acquisition module and is used for receiving the vibration signal and performing preprocessing, the diagnosis module is connected to the output end of the preprocessing module and is used for receiving the preprocessed vibration signal and outputting a diagnosis report, and the visualization module is connected to the output end of the diagnosis module and is used for visually displaying the diagnosis report. The device integrates the signal acquisition module, the preprocessing module, the diagnosis module and the visualization module, has an intelligent NVH performance diagnosis function, realizes one-key diagnosis of the NVH performance, solves the problem of high use threshold of the diagnosis device, and simultaneously realizes acquisition of the vibration signal by the signal acquisition module and preprocessing of the vibration signal by the preprocessing module, solves the problem of high data acquisition difficulty, and thus improves the accuracy and efficiency of the NVH performance diagnosis.

[0017] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated into and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor. In the drawings:

[0019] Figure 1 is a schematic diagram of a vehicle NVH performance diagnosis device according to an exemplary embodiment of the present application;

[0020] Figure 2 is an order spectrum diagram of a vibration signal according to an exemplary embodiment of the present application;

[0021] Figure 3 is a schematic diagram of another vehicle NVH performance diagnosis device according to an exemplary embodiment of the present application;

[0022] Figure 4 is a schematic diagram of a vehicle NVH performance diagnosis device according to an exemplary embodiment of the present application;

[0023] Wherein, 1-sensor interface; 2-CAN bus interface; 3-human-computer interaction interface; 4-Universal Serial Bus interface; 5-network interface; 6-headphone interface; 7-power interface; 8-power switch; 9-heat dissipation port. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail below with specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure of the present specification. The present application can also be implemented or applied by different specific embodiments, and each detail in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present application are for describing specific specific embodiments, and are not intended to limit the protection scope of the present application. The test methods in the following examples are not specified, and are usually performed under conventional conditions or according to the conditions recommended by the manufacturers.

[0025] Please refer to Figures 1-4, it is known that the structure, proportion, size and the like shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation of the utility model, therefore, any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose of the utility model, should still fall within the scope of the disclosed technology.

[0026] When the embodiments give a numerical range, it should be understood that, unless otherwise stated by the utility model, each numerical range and any numerical value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the utility model and the understanding of the prior art by those skilled in the art and the description of the utility model can also use any method, equipment and material of the prior art similar or equivalent to the method, equipment and material of the embodiment of the utility model to realize the utility model.

[0027] The NVH performance of the whole vehicle is directly related to the user experience, so the industry is also developing diagnostic technology for vehicle NVH to detect and eliminate the influence of these noise and vibration sources on the driving experience. But the inventors of the present application found that the diagnostic equipment for vehicle NVH performance still has some deficiencies, especially the problem of high threshold and difficult data acquisition, which makes the diagnostic precision and efficiency of NVH performance low.

[0028] Therefore, please refer to Figure 1 , Figure 1 is a schematic diagram of a vehicle NVH performance diagnostic equipment according to an example embodiment of the utility model. As Figure 1 shown, the example vehicle NVH performance diagnostic equipment 100 at least includes a signal acquisition module 110, a preprocessing module 120, a diagnostic module 130 and a visualization module 140, which are described in detail as follows:

[0029] The signal acquisition module 110 is used to acquire the vibration signal of the device to be tested.

[0030] The preprocessing module 120 is connected to the output end of the signal acquisition module 110, used to receive the vibration signal and perform preprocessing.

[0031] The diagnostic module 130 is connected to the output end of the preprocessing module 120, used to receive the preprocessed vibration signal and output the diagnostic report.

[0032] The visualization module 140 is connected to the output end of the diagnosis module 130, and is configured to visualize the diagnosis report.

[0033] The device to be tested includes a reducer, a motor, a bearing, and the like.

[0034] In this embodiment, the signal acquisition module 110 can acquire the vibration signal of the device to be tested, thereby providing data support for subsequent diagnosis. The preprocessing module 120 can preprocess the acquired signal, thereby providing accurate data support for subsequent diagnosis. The diagnosis module 130 can output a diagnosis report of the vehicle NVH performance according to the preprocessed vibration signal, thereby realizing one-key diagnosis of the vehicle NVH performance. The visualization module 140 can visualize the diagnosis report, thereby realizing intuitive display of the diagnosis result.

[0035] It should be noted that the diagnosis module 130 in this embodiment receives the preprocessed vibration signal and outputs the diagnosis result, which can be realized based on an existing vehicle NVH performance analysis method or program.

[0036] In this embodiment, the vehicle NVH performance diagnosis device integrates the signal acquisition module 110, the preprocessing module 120, the diagnosis module 130, and the visualization module 140, and has an intelligent NVH performance diagnosis function, thereby realizing one-key diagnosis of the NVH performance, solving the problem of high use threshold of the diagnosis device. Meanwhile, the signal acquisition module 110 realizes acquisition of the vibration signal, and the preprocessing module 120 can realize preprocessing of the vibration signal, thereby solving the problem of high data acquisition difficulty, and improving the accuracy and efficiency of the NVH performance diagnosis.

[0037] For example, the diagnosis report includes process data and result data of diagnosis, wherein the process data includes chart data (such as a frequency spectrum diagram and an order spectrum diagram), and the result data includes a normal or abnormal state of the NVH performance. When the NVH performance is abnormal, the result data further includes an abnormal reason.

[0038] In an embodiment, the signal acquisition module 110 includes a sensing signal acquisition unit and a CAN (Controller Area Network) bus signal acquisition unit. The sensing signal acquisition unit includes a plurality of sensor interfaces, and the plurality of sensor interfaces include a knock sensor interface. The knock sensor interface is configured to connect a knock sensor and receive the vibration signal of the device to be tested. The CAN bus signal acquisition unit includes a CAN transceiver, a CAN controller, and a plurality of CAN bus interfaces. The CAN bus interfaces are configured to connect a CAN bus and receive a CAN signal. The CAN transceiver is configured to receive the CAN signal and output a corresponding digital signal. The CAN controller is configured to receive the digital signal and output a rotation speed signal and a torque signal of the motor.

[0039] In this embodiment, the vibration sensor can adopt a knock sensor, which has the characteristics of easy processing of output signal, strong stability, low cost, simple installation, compact structure, direct fixation on the vibration sensitive position of the vehicle, frequency range of 1 kHz to 20 kHz, sensitivity of 26±8 mV / g at 5 kHz, stable operation in harsh environments such as high temperature, high humidity and high vibration, and is suitable for vibration signal collection in vehicle application scenarios and structural vibration detection caused by uncontrolled combustion in spark ignition engines. And the output voltage signal, the signal amplitude is proportional to the vibration intensity, which is convenient for subsequent pretreatment and NVH performance diagnosis.

[0040] In this embodiment, the CAN bus interface is used to connect the CAN bus of the vehicle to collect the speed and torque signals, and also can collect other vehicle CAN bus signals such as battery voltage and battery status, providing a wider application scenario for the device. In addition, the CAN transceiver uses a high-speed CAN transceiver to ensure stable transmission of CAN signals, and the CAN controller uses an embedded CAN controller to parse the CAN protocol and extract the data frame (speed and torque).

[0041] In this embodiment, the knock sensor and general CAN controller are used to greatly reduce the hardware cost. In addition, the signal acquisition module 110 is also used to collect the speed and torque signals of the motor, realizing the synchronous acquisition of the vibration signals of the devices under test and the speed and torque signals of the motor, providing consistent data support for subsequent diagnosis, and solving the problem of difficult data acquisition in vehicle NVH performance diagnosis.

[0042] Exemplarily, the plurality of sensor interfaces can be used to connect the knock sensor or other vibration sensors, and the plurality of sensor interfaces can simultaneously connect a plurality of vibration sensors to collect the vibration signals of a plurality of devices under test, realize the vibration diagnosis of a plurality of devices under test, and meet the complex NVH diagnosis demand. The number of sensor interfaces is designed based on the total sampling width of the device and the sampling frequency requirement of a single channel.

[0043] Exemplarily, in the bench test of measuring the NVH performance, one of the plurality of CAN bus interfaces can simultaneously connect one CAN bus in the bench and one CAN bus of the product. This ensures that the device can access multiple CAN bus channels at the same time, meeting the complex signal acquisition demand.

[0044] In an embodiment, the preprocessing module 120 comprises a sequence of an analog signal processing unit, an analog-to-digital conversion unit, and a time axis synchronization unit; the analog signal processing unit comprises a filter circuit, an amplification circuit, and an anti-aliasing filter circuit, the filter circuit is configured to perform filter processing on the vibration signal, the amplification circuit is configured to perform signal amplification processing on the vibration signal, and the anti-aliasing filter circuit is configured to perform anti-aliasing filter processing on the vibration signal; the analog-to-digital conversion unit comprises a 16-bit analog-to-digital converter, which is configured to perform analog-to-digital conversion on the vibration signal processed by the analog signal processing unit; and the time axis synchronization unit comprises a time synchronization circuit, which is configured to perform time axis synchronization on the vibration signal, the rotational speed signal, and the torque signal.

[0045] In this embodiment, the filter circuit is configured to perform filter processing on the vibration signal to filter out high-frequency noise in the vibration signal; the amplification circuit is configured to perform signal amplification processing on the vibration signal to ensure that the amplitude of the vibration signal is suitable for the input range of the analog-to-digital converter; the anti-aliasing filter circuit is configured to perform anti-aliasing filter processing on the vibration signal to prevent aliasing of the vibration signal; and the time synchronization circuit adds a unified timestamp to the vibration signal, the rotational speed signal, and the torque signal to ensure the time consistency of the data.

[0046] In this way, the integrated filter circuit, amplification circuit, anti-aliasing filter circuit, 16-bit analog-to-digital converter, and time synchronization circuit use digital filter technology and a 16-bit precision analog-to-digital converter to ensure high-precision acquisition and processing of the signal. In addition, the use of a 16-bit analog-to-digital converter is less costly than a 24-bit analog-to-digital converter, thereby saving hardware costs.

[0047] By way of example, the vehicle NVH performance diagnosis device is configured with two sensor interfaces, the sampling frequency of the 16-bit analog-to-digital converter is 50 kHz, and the sampling frequency requirement of each sensor channel is 25 kHz; the filter circuit uses a second-order Butterworth low-pass filter with a cutoff frequency set to 10 kHz; the signal amplification circuit uses an operational amplifier to construct a non-inverting amplification circuit with a gain set to 10 times; and the anti-aliasing filter uses an RC (Resistance-Capacitance) low-pass filter with a cutoff frequency set to 25 kHz.

[0048] In an embodiment, the filter circuit, amplification circuit, and anti-aliasing filter circuit all use shielded cables.

[0049] In this embodiment, the analog circuit uses shielded cables to prevent electromagnetic interference.

[0050] Exemplarily, while the analog circuit adopts a shielded cable, the digital / analog areas are isolated on a PCB (Printed Circuit Board) layout, and an isolation band is reserved in the middle to perform double inhibition, thereby further avoiding the influence of electromagnetic interference on signal accuracy.

[0051] In an embodiment, the diagnosis module 130 comprises an order analyzer and a central processor; the order analyzer is configured to receive the preprocessed vibration signal and the rotational speed signal and output an order spectrum; the central processor is configured to receive the order spectrum and output a diagnosis report according to a standard order spectrum corresponding to the preprocessed torque signal and the order spectrum.

[0052] In the embodiment, according to the collected data and known product information, the vibration problem of the device to be tested can be quickly located through spectrum comparison and fault library comparison, so that intelligent diagnosis and problem positioning are realized, and the use threshold of the equipment is reduced. Figure 2 , Figure 2 is an order spectrum of a vibration signal according to an exemplary embodiment of the utility model.

[0053] In the embodiment, according to the collected data and known product information, the vibration problem of the device to be tested can be quickly located through spectrum comparison and fault library comparison, so that intelligent diagnosis and problem positioning are realized, and the use threshold of the equipment is reduced.

[0054] It should be noted that the diagnosis in the embodiment is performed according to the order spectrum, which is only an exemplary way of vehicle NVH performance diagnosis and analysis, and the embodiment of the application does not limit the way of diagnosis and analysis, but also can be diagnosed according to other signal spectrum (such as order slice diagram), and can realize vehicle NVH performance diagnosis and analysis based on existing programs and software, and does not involve improvement in method, such as simple parameter comparison between the vibration signal and the standard vibration signal under the specific rotational speed signal and torque signal for diagnosis, and the embodiment of the application will not be listed one by one.

[0055] Exemplarily, the central processor adopts a high-performance embedded processor.

[0056] Exemplarily, the steps of the vehicle NVH performance diagnosis device for electric vehicle reducer abnormal sound diagnosis are as follows: 1. A knock sensor is mounted on the reducer housing, the knock sensor interface on the device is connected to the knock sensor to collect the vibration signal of the reducer, at the same time, the CAN bus interface on the device is connected to the CAN bus of the vehicle to obtain the speed signal and torque signal of the motor; 2. The vibration signal of the reducer and the speed signal and torque signal of the motor are received by the preprocessing module 120 and preprocessed; 3. The vibration signal and the speed signal after preprocessing are received by the diagnosis module 130 and the order spectrum diagram is output, and the standard order spectrum diagram under the torque signal after preprocessing is searched according to the torque signal, whether the amplitude of each order is out of standard is compared, if the 23.5 order amplitude is found to be out of standard, the gear tooth number design defect is correspondingly found, and a diagnosis report is output; 4. The diagnosis report is visually displayed by the visualization module 140, so that the diagnosis personnel can locate the gear tooth number for NVH performance repair.

[0057] In an embodiment, the visualization module 140 includes a user interaction interface, the user interaction interface includes a touch display screen and function controls configured on the touch display screen; the touch display screen is provided with a display area, and the diagnosis report is visually displayed through the display area; the function controls include signal configuration controls, flow controls, data management controls, data export controls, audio playback controls and display adjustment controls.

[0058] Among them, the touch display screen is a high-resolution liquid crystal touch screen supporting multi-point touch operation, and the touch screen is connected with the central processing unit through a high-speed interface, ensuring real-time data display and smoothness of touch operation.

[0059] In this embodiment, the signal configuration controls support DBC (Database CAN, Controller Area Network Database File) configuration of the CAN signals of the device, selection of the signal channels (such as speed, torque) to be collected, thereby filtering irrelevant signals and reducing the load of the processor; the flow controls support starting, pausing, stopping and saving data and the like; the data management controls support naming and saving of each diagnosis data, and the existing data can also be renamed; the data export controls support export of the diagnosis data; the audio playback controls support audio playing of the vibration signal; and the display adjustment controls support adjustment of the coordinate system, color and the like of the display content of the touch display screen.

[0060] In this embodiment, the touch display screen realizes intuitive display of the diagnosis results, and the touch display screen is multifunctional, simple and intuitive, and convenient for users to quickly get started.

[0061] In an embodiment, the device further comprises a data export module 150 connected to the output of the connection diagnosis module 130, the data export module 150 comprising a wired transmission unit and a wireless transmission unit, the wired transmission unit being configured with a universal serial bus interface and a network cable interface, the wireless transmission unit being configured with a wireless communication protocol, the data export module exporting the diagnosis report through at least one of the universal serial bus interface, the network cable interface and the wireless communication protocol.

[0062] In this embodiment, the serial bus interface is used for connection with external devices, supports high-speed data transmission, and facilitates users to export data in the device to a computer or other storage devices; the network cable interface is used for wired network connection, supports data export through a network cable or remote data transmission, and is suitable for scenarios requiring high-speed and stable data transmission; the wireless communication protocol, such as Bluetooth / WiFi (Wireless Fidelity), supports wireless data transmission.

[0063] In this embodiment, multiple data export modes such as serial bus, network cable, Bluetooth and WiFi are supported, forming a multi-modal data transmission channel.

[0064] In an embodiment, the device further comprises an audio output module 160 connected to the output of the preprocessing module 120, the audio output module 160 comprising a player, a loudspeaker and a headphone interface, and being used for playing the vibration signal.

[0065] In this embodiment, the audio output module 160 is used to realize the audio playback function of the device, which can be used to listen to the collected vibration signal in real time or to play the vibration signal after filtering, facilitating on-site rapid judgment of vibration problems.

[0066] In an embodiment, the device further comprises a heat dissipation port for dissipating heat generated by the device during vehicle NVH performance diagnosis.

[0067] In this embodiment, the device is designed with a heat dissipation port to ensure that the device can effectively dissipate heat during long-time work, preventing performance degradation or device damage due to overheating.

[0068] In an embodiment, the device further comprises a power module 170, the power module comprising: a power supply interface for connecting a power supply; a power switch for controlling the on-off of the power supply circuit; a DC-DC (Direct Current-Direct Current) step-down unit for step-down processing of the power supply voltage.

[0069] The power supply can be an external power supply, such as a vehicle lithium battery pack or a vehicle cigarette lighter, and the lithium battery pack can support long-time continuous work of the device.

[0070] In this embodiment, the power supply module includes a power supply interface, a power supply switch and a DC-DC step-down unit, can regulate the power supply, can support various external power input, that is, support battery power supply and cigar lighter power supply, and is convenient for on-site use.

[0071] Exemplarily, the DC-DC step-down unit is used for voltage reduction processing of the power supply voltage, can be a DC-DC step-down unit, for example, the device needs 5V voltage, and the vehicle cigar lighter power supply voltage is 12V, so that the vehicle cigar lighter 12V voltage is converted into 5V voltage required by the device through the DC-DC step-down unit.

[0072] Please refer to Figure 3 , Figure 3 is another vehicle NVH performance diagnosis equipment architecture diagram shown in an exemplary embodiment of the utility model. As shown in Figure 3 , the vehicle NVH performance diagnosis equipment includes signal acquisition module 110, preprocessing module 120, diagnosis module 130, visualization module 140, data export module 150, audio output module 160 and power supply module 170, wherein the output end of preprocessing module 120 is connected with signal acquisition module 110, the output end of diagnosis module 130 is connected with preprocessing module 120, the output end of visualization module 140 is connected with diagnosis module 130, the output end of data export module 150 is connected with diagnosis module 130, the output end of audio output module 160 is connected with preprocessing module 120, power supply module 170 is connected with signal acquisition module 110, preprocessing module 120, diagnosis module 130, visualization module 140, data export module 150 and audio output module 160 respectively, in addition, power supply module 170 is externally connected with power supply, signal acquisition module 110 is externally connected with knock sensor and CAN bus, and data export module 150 is externally connected with external equipment.

[0073] The vehicle NVH performance diagnosis equipment described above includes signal acquisition module, preprocessing module, diagnosis module and visualization module, wherein the signal acquisition module is used for acquiring vibration signals of a device to be measured, the output end of the preprocessing module is connected with the signal acquisition module, is used for receiving vibration signals and preprocessing, the output end of the diagnosis module is connected with the preprocessing module, is used for receiving preprocessed vibration signals and outputting diagnosis reports, and the output end of the visualization module is connected with the diagnosis module, is used for visualizing and displaying diagnosis reports, the equipment has intelligent NVH performance diagnosis function by integrating signal acquisition module, preprocessing module, diagnosis module and visualization module, realizes one-key diagnosis of NVH performance, solves the problem of high use threshold of diagnosis equipment, meanwhile, the signal acquisition module realizes acquisition of vibration signals, the preprocessing module can realize preprocessing of vibration signals, solves the problem of large data acquisition difficulty, so as to improve the precision and efficiency of NVH performance diagnosis.

[0074] Please refer to Figure 4 , Figure 4 is a structural schematic view of a vehicle NVH performance diagnosis equipment according to an exemplary embodiment of the present application. As shown in Figure 4 , the vehicle NVH performance diagnosis equipment box body structure design, the shell is made of high strength, light weight material, has good impact resistance and wear resistance. The device integrates signal acquisition module, pretreatment module, diagnosis module and visualization module, and is configured with a multifunctional interface panel on the side of the box body, one side of which includes a universal serial bus interface 4, a network interface 5 and a power interface 7, the other side of which includes a sensor interface 1, a CAN bus interface 2 and a headset interface 6, in addition, the side also includes a heat dissipation port 9, the other side also includes a power switch 8, and the top of the box body is also configured with a man-machine interface 3. The device adopts a portable box body, is compact in design, is convenient for handheld operation, is suitable for use in complex environments such as vehicle maintenance workshop and test site, can be used for development and debugging of NVH performance by whole vehicle or parts engineering personnel, can also be used for whole vehicle after-sales fault diagnosis by maintenance agencies, and can also monitor the state of sample parts on the parts single test bench. The device also has wide applicability in vehicle types, and is suitable for various vehicle types such as electric vehicles, hybrid vehicles and fuel cell vehicles, and meets the needs of different scenes.

[0075] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A vehicle NVH performance diagnosis device characterized by comprising: The application relates to a vibration signal acquisition and diagnosis system for a device under test, comprising: a signal acquisition module for acquiring a vibration signal of the device under test; a preprocessing module connected to an output end of the signal acquisition module for receiving the vibration signal and performing preprocessing; a diagnosis module connected to an output end of the preprocessing module for receiving the preprocessed vibration signal and outputting a diagnosis report; a visualization module connected to an output end of the diagnosis module for visualizing the diagnosis report.

2. The vehicle NVH performance diagnostic device according to claim 1, characterized by, The signal acquisition module comprises a sensing signal acquisition unit and a CAN bus signal acquisition unit. The sensing signal acquisition unit comprises a plurality of sensor interfaces, wherein an explosion sensor interface is arranged in the plurality of sensor interfaces, the explosion sensor interface is used for connecting an explosion sensor and receiving the vibration signal of the device under test; the CAN bus signal acquisition unit comprises a CAN transceiver, a CAN controller and a plurality of CAN bus interfaces, the CAN bus interfaces are used for connecting a CAN bus and receiving a CAN signal, the CAN transceiver is used for receiving the CAN signal and outputting a corresponding digital signal, and the CAN controller is used for receiving the digital signal and outputting a rotation speed signal and a torque signal of a motor.

3. The vehicle NVH performance diagnostic device of claim 2, wherein The preprocessing module comprises an analog signal processing unit, an analog-digital conversion unit and a time axis synchronization unit connected in sequence. The analog signal processing unit comprises a filter circuit, an amplification circuit and an anti-aliasing filter circuit, the filter circuit is used for performing filter processing on the vibration signal, the amplification circuit is used for performing signal amplification processing on the vibration signal, and the anti-aliasing filter circuit is used for performing anti-aliasing filter processing on the vibration signal. The analog-digital conversion unit comprises a 16-bit analog-digital converter, which is used for performing analog-digital conversion on the vibration signal processed by the analog signal processing unit. The time axis synchronization unit comprises a time synchronization circuit, which is used for performing time axis synchronization on the rotation speed signal, the torque signal and the vibration signal processed by the analog-digital conversion unit.

4. The vehicle NVH performance diagnostic device of claim 3, wherein The filter circuit, the amplification circuit and the anti-aliasing filter circuit all adopt shielded cables.

5. The vehicle NVH performance diagnostic device of claim 3, wherein The diagnosis module comprises an order analyzer and a central processing unit. The order analyzer is used for receiving the preprocessed vibration signal and the rotation speed signal and outputting an order spectrum diagram. The central processing unit is used for receiving the order spectrum diagram and outputting the diagnosis report according to the order spectrum diagram and a standard order spectrum diagram corresponding to the preprocessed torque signal.

6. The vehicle NVH performance diagnostic device of claim 1, wherein The visualization module comprises a user interaction interface, the user interaction interface comprises a touch display screen and function controls arranged on the touch display screen. The touch display screen is provided with a display area, and the diagnosis report is visualized and displayed through the display area. The function controls comprise signal configuration controls, flow controls, data management controls, data export controls, audio playback controls and display adjustment controls.

7. The vehicle NVH performance diagnostic device of claim 6, wherein The device further comprises a data export module connected to the output end of the diagnosis module, wherein the data export module comprises a wired transmission unit and a wireless transmission unit, the wired transmission unit is configured with a universal serial bus interface and a network cable interface, the wireless transmission unit is configured with a wireless communication protocol, and the data export module exports the diagnosis report through at least one of the universal serial bus interface, the network cable interface and the wireless communication protocol.

8. The vehicle NVH performance diagnostic device of claim 6, wherein, The device further comprises an audio output module connected to the output end of the preprocessing module, wherein the audio output module comprises a player, a loudspeaker and a headphone interface, and is used for playing the vibration signal.

9. The vehicle NVH performance diagnostic device according to any one of claims 1 to 8, characterized by, The device further comprises a heat dissipation port for discharging heat generated by the device during the diagnosis of the vehicle NVH performance.

10. The vehicle NVH performance diagnostic device of claim 9, wherein, The device further comprises a power module, wherein the power module comprises: a power interface for connecting a power supply; a power switch for controlling the on-off of a power supply circuit; a DC-DC step-down unit for step-down processing of a power supply voltage.

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