Time synchronization method, device and equipment for NVH signal and CAN signal and medium

Abstract

This invention relates to the field of vehicle inspection technology, providing a method, apparatus, device, and medium for time synchronization of NVH signals and CAN signals. The time synchronization method includes: synchronously transmitting a reference signal to an NVH signal acquisition device and a CAN signal acquisition device in response to a reference signal; determining a target NVH signal and a characteristic reference signal, and the time difference between them based on the NVH signal acquisition device, based on the NVH signal acquired by the NVH signal acquisition device and the reference signal; determining a reference time based on the CAN signal acquisition device based on the time difference and the characteristic reference signal acquired by the CAN signal acquisition device; and obtaining a target CAN signal that is time-synchronized with the target NVH signal from the signal acquired by the CAN signal acquisition device, at least based on the reference time. This invention's time synchronization scheme, by introducing a reference signal, conveniently and accurately achieves time synchronization of NVH signals and CAN signals, enabling the acquisition of time-synchronized target NVH signals and target CAN signals for subsequent analysis.

Description

Technical Field

[0001] This invention relates to the field of vehicle inspection technology, and more specifically, to a method, apparatus, device, and medium for time synchronization of NVH signals and CAN signals. Background Technology

[0002] During vehicle operation, it is necessary to collect NVH signals (NVH: Noise, Vibration, Harshness, which characterizes the noise and vibration performance of the component under test) and CAN signals (CAN: Controller Area Network, which characterizes the operating status of the component under test) from the component under test (such as the whole vehicle or certain parts) in order to analyze the causes of abnormal operating conditions such as noise / vibration of the component under test based on the NVH signals and CAN signals.

[0003] The NVH and CAN signals are acquired by two different devices. Due to differences in response time and acquisition frequency, there is a time asynchrony between the two devices. This causes the CAN signal to be unable to be accurately obtained after the noise / vibration occurrence time is determined from the NVH signal when analyzing the component under test. Consequently, it is impossible to accurately analyze the key factors that cause the abnormal operating conditions such as noise / vibration of the component under test.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a method, apparatus, device and medium for time synchronization of NVH signals and CAN signals, which can conveniently and accurately achieve time synchronization of NVH signals and CAN signals by introducing a reference signal, and can obtain the target NVH signal and target CAN signal for time synchronization for subsequent analysis.

[0006] According to one aspect of the present invention, a time synchronization method for NVH signals and CAN signals is provided, comprising: synchronously transmitting the reference signal to an NVH signal acquisition device and a CAN signal acquisition device in response to the reference signal; determining a target NVH signal and a characteristic reference signal based on the NVH signal acquired by the NVH signal acquisition device and the reference signal, and obtaining a time difference between the characteristic reference signal and the target NVH signal based on the NVH signal acquisition device; determining a reference time based on the CAN signal acquisition device based on the time difference and the characteristic reference signal acquired by the CAN signal acquisition device; and obtaining a target CAN signal that is time-synchronized with the target NVH signal from the signal acquired by the CAN signal acquisition device, at least based on the reference time.

[0007] The aforementioned time synchronization method introduces a reference signal, which is synchronously transmitted to both the NVH signal acquisition device and the CAN signal acquisition device, ensuring that both devices acquire the same reference signal. Based on the signal data acquired by the NVH signal acquisition device, the target NVH signal (e.g., an NVH signal characterizing performance abnormalities) and the characteristic reference signal used for synchronization positioning can be determined for subsequent analysis. Therefore, based on the characteristic reference signal and its time difference with the target NVH signal, a reference time based on the CAN signal acquisition device can be determined. Furthermore, based on this reference time, the target CAN signal, which is time-synchronized with the target NVH signal, can be obtained from the signal data acquired by the CAN signal acquisition device.

[0008] Therefore, the time synchronization method described above can conveniently and accurately achieve time synchronization between NVH signals and CAN signals, and obtain the target NVH signal and target CAN signal for subsequent analysis.

[0009] In some embodiments, determining the reference time based on the CAN signal acquisition device includes: locating the time of the characteristic reference signal in the reference signal acquired by the CAN signal acquisition device; and determining the reference time based on the located time and the time difference.

[0010] Based on the characteristic reference signal, the reference time of the CAN signal acquisition device can be easily located, eliminating the time difference caused by the different response times between the CAN signal acquisition device and the NVH signal acquisition device.

[0011] In some embodiments, the feature reference signal includes a signal waveform; when locating the time corresponding to the feature reference signal, the location is performed based on the signal waveform.

[0012] By analyzing the signal waveform, it is possible to intuitively and conveniently identify the characteristic reference signal with the same signal waveform from the reference signal acquired by the NVH signal acquisition device and the reference signal acquired by the CAN signal acquisition device.

[0013] In some embodiments, the step of obtaining the NVH signal and reference signal acquired by the NVH signal acquisition device further includes: obtaining a target reference signal that is time-synchronized with the target NVH signal; obtaining a target CAN signal that is time-synchronized with the target NVH signal from the signals acquired by the CAN signal acquisition device includes: determining the target reference signal that is closest to the reference time from the reference signals acquired by the CAN signal acquisition device; and obtaining the target CAN signal that is time-synchronized with the determined target reference signal from the CAN signals acquired by the CAN signal acquisition device.

[0014] By using the target reference signal, based on the reference time determined by the characteristic reference signal, the target CAN signal that is time-synchronized with the target reference signal can be accurately determined in the signal data acquired by the CAN signal acquisition device near the reference time. This eliminates the time difference caused by the different acquisition frequencies between the CAN signal acquisition device and the NVH signal acquisition device, and makes the obtained target CAN signal and target NVH signal time-synchronized.

[0015] In some embodiments, the target reference signal includes multidimensional signal values; when obtaining the target CAN signal that is time-synchronized with the determined target reference signal, the target CAN signal is obtained based on the multidimensional signal values.

[0016] By using multidimensional signal values, the target reference signal can be accurately determined from the signal data acquired by the CAN signal acquisition device, thereby obtaining the accurate target CAN signal.

[0017] In some embodiments, the response to the reference signal further includes: fixing the device for generating the reference signal to a moving part associated with the component under test, such that the movement of the moving part triggers the generation of the reference signal; and connecting the device for transmitting the reference signal to the NVH signal acquisition device and the CAN signal acquisition device; wherein the NVH signal acquisition device and the CAN signal acquisition device are used to acquire the NVH signal and CAN signal of the component under test, respectively.

[0018] The device for generating the reference signal is fixed to the moving part associated with the component under test (DUT), and the movement of the moving part triggers the generation of the reference signal, thereby obtaining the performance data (NVH signal) and working data (CAN signal) of the DUT under its working state; the device for transmitting the reference signal is connected to the NVH signal acquisition device and the CAN signal acquisition device to facilitate the synchronous transmission of the reference signal to the NVH signal acquisition device and the CAN signal acquisition device.

[0019] In some embodiments, the target NVH signal is signal data with abnormal fluctuations in the NVH signal; the time synchronization method further includes: analyzing the cause of the abnormality based on the target NVH signal and the target CAN signal.

[0020] Abnormal fluctuations in NVH signals indicate abnormal performance of the component under test at the corresponding time. By using a target CAN signal that is time-synchronized with the target NVH signal indicating the abnormal performance, the factors causing the abnormal performance of the component under test can be accurately analyzed, thus enabling performance testing of the component under test.

[0021] In some embodiments, the time synchronization method is applied to an integrated braking control system or an electronic brake booster.

[0022] By applying the time synchronization method to the integrated braking control system / electronic brake booster, the NVH and CAN signals of the integrated braking control system / electronic brake booster can be synchronized in time, and the target NVH and target CAN signals of the integrated braking control system / electronic brake booster can be obtained, which facilitates the performance testing of the integrated braking control system / electronic brake booster.

[0023] According to another aspect of the present invention, a time synchronization device for NVH signals and CAN signals is provided for implementing the time synchronization method as described in any of the above embodiments. The time synchronization device includes: a reference signal synchronization module, configured to synchronously transmit the reference signal to an NVH signal acquisition device and a CAN signal acquisition device in response to a reference signal; an NVH signal processing module, configured to determine a target NVH signal and a characteristic reference signal based on the NVH signal and the reference signal acquired by the NVH signal acquisition device, and obtain a time difference between the characteristic reference signal and the target NVH signal based on the NVH signal acquisition device; a reference time determination module, configured to determine a reference time based on the CAN signal acquisition device based on the time difference and the characteristic reference signal acquired by the CAN signal acquisition device; and a CAN signal processing module, configured to obtain a target CAN signal that is time-synchronized with the target NVH signal from the signal acquired by the CAN signal acquisition device, at least based on the reference time.

[0024] The aforementioned time synchronization device introduces a reference signal through a reference signal synchronization module, synchronously transmitting the reference signal to the NVH signal acquisition device and the CAN signal acquisition device, ensuring that both devices acquire the same reference signal. The NVH signal processing module determines the target NVH signal (e.g., an NVH signal characterizing performance abnormalities) and a characteristic reference signal for synchronization positioning based on the signal data acquired by the NVH signal acquisition device. The reference time determination module determines the reference time based on the characteristic reference signal and its time difference with the target NVH signal using the CAN signal acquisition device. Furthermore, the CAN signal processing module obtains the target CAN signal, which is time-synchronized with the target NVH signal, from the signal data acquired by the CAN signal acquisition device based on the reference time.

[0025] Therefore, the aforementioned time synchronization device can conveniently and accurately achieve time synchronization between NVH signals and CAN signals, and obtain the target NVH signal and target CAN signal for subsequent analysis.

[0026] In some embodiments, the reference signal is generated by an acceleration sensor fixed to a moving part associated with the component under test; the reference signal synchronization module is connected via a CAN bus to the NVH signal acquisition device for acquiring the NVH signal of the component under test and the CAN signal acquisition device for acquiring the CAN signal of the component under test.

[0027] By using an accelerometer fixed to a moving part associated with the component under test (DUT), a reference signal can be generated when the moving part moves (corresponding to the operation of the DUT). This allows the performance status of the DUT to be detected based on the NVH and CAN signals acquired by the NVH and CAN signal acquisition devices during this stage. In addition, the reference signal synchronization module is connected to the NVH and CAN signal acquisition devices via a CAN bus to synchronously transmit the reference signal to the NVH and CAN signal acquisition devices via the CAN bus.

[0028] According to another aspect of the present invention, an electronic device is provided, comprising: a processor; a memory storing executable instructions; wherein, when the executable instructions are executed by the processor, they implement the time synchronization method for NVH signals and CAN signals as described in any of the above embodiments.

[0029] The aforementioned electronic equipment can conveniently and accurately achieve time synchronization between NVH signals and CAN signals, and obtain the target NVH signal and target CAN signal for subsequent analysis.

[0030] According to another aspect of the present invention, a computer-readable storage medium is provided for storing a program that, when executed by a processor, implements the time synchronization method for NVH signals and CAN signals as described in any of the above embodiments.

[0031] When the aforementioned storage medium is executed, it can conveniently and accurately achieve time synchronization between NVH signals and CAN signals, and obtain the target NVH signal and target CAN signal for subsequent analysis.

[0032] The beneficial effects of this invention compared to the prior art include at least the following:

[0033] The time synchronization scheme for NVH and CAN signals of the present invention introduces a reference signal and synchronously transmits the reference signal to both the NVH signal acquisition device and the CAN signal acquisition device, enabling both devices to acquire the same reference signal. Based on the signal data acquired by the NVH signal acquisition device, a target NVH signal (e.g., an NVH signal characterizing performance abnormalities) and a characteristic reference signal for synchronization positioning can be determined for subsequent analysis. Therefore, based on the characteristic reference signal and its time difference with the target NVH signal, a reference time based on the CAN signal acquisition device can be determined. Furthermore, based on the reference time, a target CAN signal synchronized with the target NVH signal can be obtained from the signal data acquired by the CAN signal acquisition device.

[0034] The time synchronization scheme for NVH and CAN signals of the present invention can conveniently and accurately realize the time synchronization of NVH and CAN signals, and obtain the target NVH and target CAN signals for subsequent analysis.

[0035] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0037] Figure 1 This diagram illustrates the steps of the time synchronization method for NVH signals and CAN signals in an embodiment of the present invention.

[0038] Figure 2This diagram illustrates the implementation architecture for time synchronization of NVH signals and CAN signals in a wire-controlled braking product according to an embodiment of the present invention.

[0039] Figure 3 This diagram illustrates the NVH signal and reference signal acquired by the NVH signal acquisition device in an embodiment of the present invention.

[0040] Figure 4 and Figure 5 Show Figure 3 A magnified view of a portion of the image;

[0041] Figure 6 This diagram illustrates the CAN signal and reference signal acquired by the CAN signal acquisition device in an embodiment of the present invention.

[0042] Figure 7 and Figure 8 Show Figure 6 A magnified view of a portion of the image;

[0043] Figure 9 This diagram illustrates a module schematic of the time synchronization device for NVH signals and CAN signals in an embodiment of the present invention.

[0044] Figure 10 A schematic diagram of the structure of an electronic device in an embodiment of the present invention is shown. Detailed Implementation

[0045] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to fully and completely convey the concept of the exemplary embodiments to those skilled in the art.

[0046] The accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0047] Furthermore, the processes shown in the accompanying drawings are merely illustrative and do not necessarily include all steps. For example, some steps can be broken down, some steps can be combined or partially combined, and the actual execution order may change depending on the actual situation. The terms "first," "second," and similar terms used in the specific description do not indicate any order, quantity, or importance, but are only used to distinguish different components. It should be noted that, unless otherwise specified, embodiments of the present invention and features in different embodiments can be combined with each other.

[0048] Figure 1 This invention illustrates the main steps of the time synchronization method for NVH signals and CAN signals in an embodiment of the present invention, with reference to... Figure 1 As shown, the time synchronization method for NVH signals and CAN signals provided in this embodiment of the invention includes:

[0049] In step S110, in response to the reference signal, the reference signal is synchronously transmitted to the NVH signal acquisition device and the CAN signal acquisition device.

[0050] NVH signal acquisition equipment is used to acquire NVH signals that characterize the performance status of the component under test (which may be the whole vehicle or one or more parts of the vehicle), while CAN signal acquisition equipment is used to acquire CAN signals that characterize the working status of the component under test.

[0051] The reference signal may include one or more. By introducing the reference signal, the reference signal is synchronously transmitted to the NVH signal acquisition device and the CAN signal acquisition device, so that the NVH signal acquisition device and the CAN signal acquisition device acquire the same reference signal.

[0052] Step S120: Based on the NVH signal and reference signal acquired by the NVH signal acquisition device, determine the target NVH signal and the characteristic reference signal, and obtain the time difference between the characteristic reference signal and the target NVH signal based on the NVH signal acquisition device.

[0053] The target NVH signal can be signal data that characterizes abnormal performance in NVH signals, such as signal data that generates abnormal vibration (e.g., vibration amplitude greater than a certain threshold), signal data that generates abnormal noise (e.g., noise amplitude greater than a certain threshold), and so on.

[0054] Feature reference signals are signal data that are easy to locate within a reference signal, such as signal data with special waveforms or special values ​​that facilitate location.

[0055] Step S130: Determine the reference time based on the time difference and the characteristic reference signal acquired by the CAN signal acquisition device.

[0056] Step S140: Obtain the target CAN signal that is time-synchronized with the target NVH signal from the signal acquired by the CAN signal acquisition device, at least according to the reference time.

[0057] The aforementioned time synchronization method, by introducing a reference signal, can conveniently and accurately achieve time synchronization between NVH signals and CAN signals, and obtain the target NVH signal and target CAN signal for subsequent analysis. For example, it can obtain the target NVH signal that characterizes abnormal performance and the target CAN signal that is time-synchronized with it, thereby accurately analyzing the key factors that cause abnormal operating conditions such as noise / vibration.

[0058] In some embodiments, determining the reference time based on the CAN signal acquisition device includes: identifying the time of the location feature reference signal in the reference signal acquired by the CAN signal acquisition device; and determining the reference time based on the located time and time difference.

[0059] Based on the characteristic reference signal, the reference time of the CAN signal acquisition device can be easily located, eliminating the time difference caused by the different response times between the CAN signal acquisition device and the NVH signal acquisition device.

[0060] In some embodiments, the feature reference signal includes a signal waveform; when locating the time corresponding to the feature reference signal, the location is performed based on the signal waveform.

[0061] Signal waveforms, such as peaks and troughs, allow for intuitive and convenient identification of characteristic reference signals with the same waveforms from the reference signals acquired by NVH signal acquisition devices and CAN signal acquisition devices.

[0062] In some embodiments, based on the NVH signal and reference signal acquired by the NVH signal acquisition device, the method further includes: obtaining a target reference signal that is time-synchronized with the target NVH signal; obtaining a target CAN signal that is time-synchronized with the target NVH signal from the signals acquired by the CAN signal acquisition device, including: determining the target reference signal closest to the reference time from the reference signals acquired by the CAN signal acquisition device; and obtaining the target CAN signal that is time-synchronized with the determined target reference signal from the CAN signals acquired by the CAN signal acquisition device.

[0063] By using the target reference signal, based on the reference time determined by the characteristic reference signal, the target CAN signal that is time-synchronized with the target reference signal can be accurately determined in the signal data acquired by the CAN signal acquisition device near the reference time. This eliminates the time difference caused by the different acquisition frequencies between the CAN signal acquisition device and the NVH signal acquisition device, and makes the obtained target CAN signal and target NVH signal time-synchronized.

[0064] In some embodiments, the target reference signal includes multidimensional signal values; when obtaining a target CAN signal that is time-synchronized with the determined target reference signal, the target CAN signal is obtained based on the multidimensional signal values.

[0065] By using multidimensional signal values, the target reference signal can be accurately determined from the signal data acquired by the CAN signal acquisition device, thereby obtaining the accurate target CAN signal.

[0066] For example, the reference signal includes signal data on the X-axis and signal data on the Z-axis. When using signal waveforms to locate the feature reference signal, a one-dimensional signal waveform, such as a signal waveform on the Z-axis, is used to achieve rapid location of the feature reference signal. Here, when using signal values ​​to locate the target reference signal, multi-dimensional signal values ​​are used, including signal values ​​on the X-axis and signal values ​​on the Z-axis, to achieve accurate location of the target reference signal.

[0067] In some embodiments, in response to a reference signal, the method further includes: fixing the device for generating the reference signal to a moving part associated with the component under test, so that the movement of the moving part triggers the generation of the reference signal; and connecting the device for transmitting the reference signal to an NVH signal acquisition device and a CAN signal acquisition device; wherein the NVH signal acquisition device and the CAN signal acquisition device are used to acquire the NVH signal and CAN signal of the component under test, respectively.

[0068] The device used to generate the reference signal can be an accelerometer, which is fixed to a moving part associated with the component under test, so that the movement of the moving part triggers the generation of the reference signal, thereby obtaining the performance data (NVH signal) and operating data (CAN signal) of the component under test in its working state.

[0069] The device used for transmitting reference signals can be a reference signal synchronization module for signal conversion and transmission, which can be connected to NVH signal acquisition devices and CAN signal acquisition devices via a CAN bus. This reference signal synchronization module can convert the voltage-form reference signal generated by the accelerometer into a CAN-form reference signal, and synchronously transmit the CAN-form reference signal to the NVH signal acquisition devices and CAN signal acquisition devices via a CAN bus.

[0070] In the above embodiments, the target NVH signal can be signal data with abnormal fluctuations in the NVH signal; the time synchronization method further includes: analyzing the cause of the abnormality based on the target NVH signal and the target CAN signal.

[0071] Abnormal fluctuations in NVH signals characterize the performance anomalies of the component under test at the corresponding moment. As mentioned above, these can be signal data that generates abnormal vibrations or abnormal noise within the NVH signal. By using a target CAN signal synchronized with the target NVH signal characterizing the performance anomaly, the cause of the anomaly can be accurately analyzed, enabling performance testing of the component under test. Specific analysis and testing methods can be determined as needed, and this invention does not impose any limitations on them.

[0072] In some embodiments, the time synchronization method described above can be applied to an integrated brake control system (IBC) or an electronic brake booster (EBB).

[0073] Both the Integrated Brake Control System (IBC) and the Electronic Brake Booster (EBB) are cutting-edge brake-by-wire products. By applying a time synchronization method to the IBC / EBB, the NVH (Noise, Vibration, and Harshness) and CAN (Conduction, Harshness, and Noise) signals of the IBC / EBB can be synchronized in time. This allows for the acquisition of target NVH and CAN signals for time synchronization, facilitating performance testing of the IBC / EBB, optimizing its NVH noise reduction performance, and ensuring comfort and a good user experience for these brake-by-wire products.

[0074] The following example, applied to brake-by-wire products, illustrates the time synchronization method for NVH signals and CAN signals.

[0075] Figure 2 This illustrates the implementation architecture for time synchronization of NVH signals and CAN signals in a wire-controlled braking product according to an embodiment of the present invention. (Refer to...) Figure 2 As shown, when synchronizing the NVH signal and CAN signal of the brake-by-wire product 200, the NVH sensor 210, including an NVH vibration sensor for collecting vibration signals and an NVH sound sensor for collecting noise signals, is fixed to the test component 200a of the brake-by-wire product 200, and the accelerometer 220 for generating reference signals is fixed to the moving component 200b of the brake-by-wire product 200.

[0076] The brake-by-wire product 200 mentioned in this embodiment may be a brake control system IBC, an electronic brake booster EBB, or other brake-by-wire products whose performance needs to be tested.

[0077] NVH signal acquisition device 230 and CAN signal acquisition device 240 are respectively connected to brake-by-wire product 200 to acquire NVH signals and CAN signals. In addition, reference signal synchronization module 250 is connected to brake-by-wire product 200 to acquire and convert reference signals, and synchronously output them to NVH signal acquisition device 230 and CAN signal acquisition device 240.

[0078] In this embodiment, by fixing the accelerometer 220 to the moving part 200b of the brake-by-wire product 200, the accelerometer 220 will move when the brake-by-wire product 200 is braking and releasing, generating a constantly changing voltage value, i.e., a voltage-form reference signal; the reference signal synchronization module 250 further converts the voltage-form reference signal into a CAN-form reference signal, and synchronously transmits it to the NVH signal acquisition device 230 and the CAN signal acquisition device 240.

[0079] In actual testing, considering factors such as the overall vehicle condition and safety, the acceleration sensor 220 can be fixed to any component that can move during the test data acquisition process, such as the driver's right foot.

[0080] Figure 3 The image shows the NVH signal and reference signal (hereinafter referred to as the first reference signal) acquired by the NVH signal acquisition device. Figure 6 The diagram shows the CAN signal and reference signal (hereinafter referred to as the second reference signal) acquired by the CAN signal acquisition device. Figure 3 In the diagram, the horizontal axis represents time (T), in seconds, and the vertical axis represents the values ​​of the NVH signal and the first reference signal, in vibration units G and voltage units V, respectively. Figure 6 In the diagram, the horizontal axis represents time (T), in seconds, and the vertical axis represents the values ​​of the CAN signal and the second reference signal, both in voltage units (V). Figure 2 , Figure 3 and Figure 6 As shown, the reference signal synchronization module 250 synchronously transmits the reference signal to the NVH signal acquisition device 230 and the CAN signal acquisition device 240. Thus, the NVH signal acquisition device 230 acquires the NVH signal 310 of the brake-by-wire product 200 and the first reference signal 320 transmitted by the reference signal synchronization module 250; the CAN signal acquisition device 240 acquires the CAN signal 410 of the brake-by-wire product 200 and the second reference signal 420 transmitted by the reference signal synchronization module 250. Both the first reference signal 320 and the second reference signal 420 include X-axis signal data and Z-axis signal data. The first reference signal 320 and the second reference signal 420 are the same reference signal, but the specific mining time and acquisition frequency are determined by the NVH signal acquisition device 230 and the CAN signal acquisition device 240.

[0081] Continue to refer to Figure 2 The NVH signals, CAN signals, and reference signals collected by each acquisition device are transmitted to the signal processing device 260 for time synchronization of the NVH and CAN signals. The signal processing device 260 can be a computer, a processor, or other electronic device with signal processing capabilities capable of synchronizing the NVH and CAN signals. Since the reference signal emitted by the reference signal synchronization module 250 is synchronized, when the NVH signal acquisition device 230 and the CAN signal acquisition device 240 each acquire their respective reference signals, time synchronization of the NVH and CAN signals can be achieved based on the identical reference signals and their times on the time axes of the NVH signal acquisition device 230 and the CAN signal acquisition device 240. Therefore, the precise values ​​of the CAN signals, such as the specific stroke and speed of the brake-by-wire product 200, can be accurately located at the moment of vibration / noise occurrence, facilitating performance testing of the brake-by-wire product 200.

[0082] Figure 4 and Figure 5 Show Figure 3 A magnified view of a portion of the image. Figure 7 and Figure 8 Show Figure 6 A magnified view of a portion of the image; combined with... Figures 2 to 8 As shown, based on the NVH signal 310 and the first reference signal 320 acquired by the NVH signal acquisition device 230, and the CAN signal 410 and the second reference signal 420 acquired by the CAN signal acquisition device 240, the implementation process for time synchronization of the NVH signal and CAN signal of the line-controlled brake product 200 includes:

[0083] First, the target NVH signal 310' and the target reference signal 320' are determined based on the NVH signal 310 and the first reference signal 320.

[0084] Combination Figure 4 and Figure 3 As shown, in the NVH signal 310, the target NVH signal 310' representing the abnormal vibration is identified, with a corresponding signal value of 14.60G, and the vibration occurrence time T is located. vib The value is 17.30s; therefore, the vibration occurrence time T is located in the first reference signal 320. vib The corresponding target reference signal 320' includes a signal value of 3.31V on the X-axis and a signal value of 8.85V on the Z-axis.

[0085] Secondly, the feature reference signal 320'' is determined for synchronous positioning, and the time difference between the feature reference signal 320'' and the target NVH signal 310' is obtained.

[0086] Combination Figures 3 to 5 As shown, in the first reference signal 320, a signal waveform with obvious characteristics is selected, for example, the second-to-last lowest value (trough) of the signal data along the Z-axis can be selected as the characteristic reference signal 320''. The time corresponding to this characteristic reference signal 320'' is T. valley (15.83s), then the time difference T between the characteristic reference signal 320'' and the target NVH signal 310' is... diff =17.31-15.83=1.48s.

[0087] Finally, the reference time is determined in the second reference signal 420; and the target CAN signal 410', which is time-synchronized with the target reference signal 320', is accurately located near the reference time of 21.4s.

[0088] Combination Figure 6 and Figure 7 As shown, in the second reference signal 420, the time T corresponding to the characteristic reference signal 320'' is... R1 The value is 19.92s; therefore, based on 19.92s and the time difference of 1.48s determined in the previous step, the reference time is obtained as 19.92 + 1.48 = 21.4s.

[0089] Combination Figure 6 and Figure 8 As shown, based on CAN signal 410 and the second reference signal 420, the target time T, with signal values ​​of 3.31V and 8.85V on the X-axis and Z-axis respectively, can be accurately located around the reference time of 21.4s. target At the target time T target The target CAN signal 410' was obtained, and its corresponding signal value is 9.0625V.

[0090] At this point, the time synchronization of the NVH signal and the CAN signal is completed, and the target NVH signal 310' and the target CAN signal 410' for time synchronization are obtained.

[0091] In summary, the time synchronization method for NVH and CAN signals of the present invention introduces a reference signal and synchronously transmits it to both the NVH and CAN signal acquisition devices, ensuring that both devices acquire the same reference signal. Based on the signal data acquired by the NVH signal acquisition device, the target NVH signal for subsequent analysis and the target reference signal and characteristic reference signal for synchronization positioning can be determined. Based on the characteristic reference signal, the reference time based on the CAN signal acquisition device can be easily located, eliminating the time difference caused by the different response times between the CAN and NVH signal acquisition devices. Using the target reference signal, based on the reference time determined by the characteristic reference signal, the target CAN signal synchronized with the target reference signal can be accurately determined from the signal data acquired by the CAN signal acquisition device, eliminating the time difference caused by the different acquisition frequencies between the CAN and NVH signal acquisition devices, thus synchronizing the obtained target CAN signal with the target NVH signal. Based on the time-synchronized target NVH and target CAN signals, the performance testing and analysis of the component under test can be accurately performed.

[0092] Furthermore, the time synchronization method for NVH and CAN signals of the present invention has the following advantages: the solution is lightweight and portable, making it very suitable for the synchronous acquisition of NVH and CAN signals of single components such as brake-by-wire products, and can also be used for the synchronous acquisition of NVH and CAN signals under vehicle road test conditions, without occupying limited vehicle space resources; the power supply required for the reference signal generation and synchronization modules is relatively convenient, and a power supply of 5V to 60V is acceptable, specifically using vehicle ECU wiring harnesses, small household power banks, car batteries, car cigarette lighters, etc.; the database required for generating the reference signal is a self-built file, and the accuracy can be freely adjusted according to different working conditions, and is not limited by factors such as the design requirements of the component under test; for extremely complex situations, the reference signal synchronization module can be expanded to multiple channels, such as eight-channel sensor signal conversion and transmission, to ensure the acquisition requirements under high-precision working conditions.

[0093] This invention also provides a time synchronization device for NVH signals and CAN signals, which can be used to implement the time synchronization method for NVH signals and CAN signals described in any of the above embodiments. The features and principles of the time synchronization methods described in any of the above embodiments can be applied to the following time synchronization device embodiments. In the following time synchronization device embodiments, the features and principles of time synchronization of NVH signals and CAN signals already explained will not be repeated.

[0094] Figure 9 This diagram illustrates the main modules of the time synchronization device for NVH and CAN signals in an embodiment of the present invention; see reference. Figure 9 As shown, the time synchronization device 500 for NVH signals and CAN signals provided in this embodiment of the invention includes:

[0095] The reference signal synchronization module 250 is used to synchronously transmit the reference signal to the NVH signal acquisition device and the CAN signal acquisition device in response to the reference signal.

[0096] The NVH signal processing module 520 is used to determine the target NVH signal and the characteristic reference signal based on the NVH signal and the reference signal acquired by the NVH signal acquisition device, and to obtain the time difference between the characteristic reference signal and the target NVH signal based on the NVH signal acquisition device.

[0097] The reference time determination module 530 is used to determine the reference time based on the CAN signal acquisition device according to the time difference and the characteristic reference signal acquired by the CAN signal acquisition device.

[0098] The CAN signal processing module 540 is used to obtain a target CAN signal that is time-synchronized with the target NVH signal from the signal acquired by the CAN signal acquisition device, at least according to a reference time.

[0099] The aforementioned time synchronization device 500 introduces a reference signal through the reference signal synchronization module 250, and synchronously transmits the reference signal to the NVH signal acquisition device and the CAN signal acquisition device, so that the NVH signal acquisition device and the CAN signal acquisition device acquire the same reference signal; the NVH signal processing module 520 determines the target NVH signal (e.g., an NVH signal characterizing performance abnormalities) and the characteristic reference signal for synchronization positioning based on the signal data acquired by the NVH signal acquisition device; the reference time determination module 530 determines the reference time based on the characteristic reference signal and its time difference with the target NVH signal; further, the CAN signal processing module 540 obtains the target CAN signal that is time-synchronized with the target NVH signal from the signal data acquired by the CAN signal acquisition device based on the reference time;

[0100] Therefore, the aforementioned time synchronization device 500 can conveniently and accurately achieve time synchronization between NVH signals and CAN signals, and obtain the target NVH signal and target CAN signal for subsequent analysis.

[0101] In some embodiments, the reference signal is generated by an acceleration sensor fixed to a moving part associated with the component under test; the reference signal synchronization module 250 is connected via a CAN bus to an NVH signal acquisition device for acquiring NVH signals of the component under test and a CAN signal acquisition device for acquiring CAN signals of the component under test.

[0102] By fixing an accelerometer to a moving part associated with the component under test, a reference signal can be generated when the moving part moves (corresponding to the operation of the component under test). This allows the performance status of the component under test to be detected based on the NVH and CAN signals acquired by the NVH signal acquisition device and the CAN signal acquisition device during this stage. In addition, the reference signal synchronization module 250 is connected to the NVH signal acquisition device and the CAN signal acquisition device via the CAN bus, so that the reference signal can be synchronously transmitted to the NVH signal acquisition device and the CAN signal acquisition device via the CAN bus.

[0103] For specific connection methods between the accelerometer, the reference signal synchronization module 250, and the NVH signal acquisition equipment and CAN signal acquisition equipment, please refer to [reference needed]. Figure 2 The implementation architecture shown will not be repeated here. Furthermore, the NVH signal processing module 520, reference timing determination module 530, and CAN signal processing module 540 can be integrated into... Figure 2 The signal processing device 260 shown works together to achieve time synchronization between NVH signals and CAN signals.

[0104] Furthermore, the time synchronization device 500 may also include modules that implement other process steps of the above-described time synchronization method embodiments. The specific principles of each module can be referred to the description of the above-described time synchronization method embodiments, and will not be repeated here.

[0105] The time synchronization device 500 of the present invention can conveniently and accurately realize the time synchronization of NVH signals and CAN signals, and obtain the target NVH signal and target CAN signal for subsequent analysis.

[0106] This invention also provides an electronic device, including a processor and a memory, wherein the memory stores executable instructions, and when the executable instructions are executed by the processor, the time synchronization method for NVH signals and CAN signals described in any of the above embodiments is implemented.

[0107] Figure 10 The structure of the electronic device in an embodiment of the present invention is shown; see reference Figure 10 As shown, the electronic device 600 is manifested in the form of a general-purpose computing device. The components of the electronic device 600 include, but are not limited to: a memory 610 for storing executable instructions; and a processor 620 for executing the executable instructions to implement the time synchronization method of NVH signals and CAN signals described in any of the above embodiments, to perform time synchronization of NVH signals and CAN signals, and to obtain the target NVH signal and target CAN signal for time synchronization, so as to accurately analyze the key factors causing abnormal operating conditions such as noise / vibration based on the target CAN signal that is time-synchronized with the target NVH signal that characterizes the abnormal performance.

[0108] The memory 610 may include readable media in the form of volatile storage cells, such as random access memory (RAM) and / or cache memory, and may further include read-only memory (ROM). The memory 610 may also include programs / utilities having one or more program modules, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0109] The memory 610 and the processor 620 can be connected via a bus 630. The bus 630 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0110] Electronic device 600 can also communicate with one or more external devices via its input / output (I / O) interface. These external devices may include keyboards, pointing devices, Bluetooth devices, smart terminal devices, other computing devices, etc. These external devices enable users to interact and communicate with electronic device 600. Electronic device 600 can also communicate with multiple networks (such as local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via its network adapter. The network adapter can communicate with other modules of electronic device 600 via bus 630.

[0111] This invention also provides a computer-readable storage medium for storing a program that, when executed, implements the time synchronization method for NVH signals and CAN signals described in any of the above embodiments. In some possible implementations, various aspects of this invention can also be implemented as a program product comprising program code that, when run on a terminal device, causes the terminal device to execute the time synchronization method for NVH signals and CAN signals described in any of the above embodiments.

[0112] When the storage medium of the present invention is executed, it can realize a time synchronization method for NVH signals and CAN signals, realize the time synchronization of NVH signals and CAN signals, and obtain the target NVH signal and target CAN signal for time synchronization, so as to accurately analyze the key factors causing abnormal operating conditions such as noise / vibration based on the target CAN signal that is time-synchronized with the target NVH signal that characterizes the abnormal performance.

[0113] The storage medium may be a portable compact disc read-only memory (CD-ROM) and include program code, and may run on a terminal device, such as a personal computer. However, the storage medium of the present invention is not limited thereto, and may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0114] The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing devices can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or they can be connected to external computing devices, such as through an Internet service provider.

[0115] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for time synchronization of NVH signals and CAN signals, characterized in that, include: In response to a reference signal, the reference signal is synchronously transmitted to the NVH signal acquisition device and the CAN signal acquisition device; Based on the NVH signal and reference signal acquired by the NVH signal acquisition device, the target NVH signal and the characteristic reference signal are determined, and the time difference between the characteristic reference signal and the target NVH signal based on the NVH signal acquisition device is obtained. Based on the time difference and the characteristic reference signal acquired by the CAN signal acquisition device, a reference time based on the CAN signal acquisition device is determined; At least based on the reference time, a target CAN signal that is time-synchronized with the target NVH signal is obtained from the signal acquired by the CAN signal acquisition device.

2. The time synchronization method as described in claim 1, characterized in that, Determining the reference time based on the CAN signal acquisition device includes: In the reference signals acquired by the CAN signal acquisition device, locate the time at which the characteristic reference signal acquired by the CAN signal acquisition device is located; Based on the located time and the time difference, the reference time based on the CAN signal acquisition device is determined.

3. The time synchronization method as described in claim 2, characterized in that, The characteristic reference signal acquired by the CAN signal acquisition device includes a signal waveform; When locating the time corresponding to the feature reference signal acquired by the CAN signal acquisition device, the location is performed based on the signal waveform.

4. The time synchronization method as described in claim 1, characterized in that, The NVH signal and reference signal acquired by the NVH signal acquisition device also include: Obtain a target reference signal that is time-synchronized with the target NVH signal; Obtaining the target CAN signal that is time-synchronized with the target NVH signal from the signal acquired by the CAN signal acquisition device includes: From the reference signals acquired by the CAN signal acquisition device, determine the target reference signal that is closest to the reference time; The target CAN signal, which is time-synchronized with the determined target reference signal, is obtained from the CAN signal acquired by the CAN signal acquisition device.

5. The time synchronization method as described in claim 4, characterized in that, The target reference signal includes multidimensional signal values; When obtaining the target CAN signal that is time-synchronized with the determined target reference signal, the target CAN signal is obtained based on the multidimensional signal values.

6. The time synchronization method as described in claim 1, characterized in that, The response prior to the reference signal further includes: The device for generating the reference signal is fixed to a moving part associated with the component under test, such that movement of the moving part triggers the generation of the reference signal; and Connect the device used to transmit the reference signal to the NVH signal acquisition device and the CAN signal acquisition device; The NVH signal acquisition device and the CAN signal acquisition device are used to acquire the NVH signal and CAN signal of the component under test, respectively.

7. The time synchronization method as described in claim 1, characterized in that, The target NVH signal is the signal data of abnormal fluctuations in the NVH signal; The time synchronization method further includes: Analyze the cause of the anomaly based on the target NVH signal and the target CAN signal.

8. The time synchronization method according to any one of claims 1-7, characterized in that, The time synchronization method is applied to integrated braking control systems or electronic brake boosters.

9. A time synchronization device for NVH signals and CAN signals, characterized in that, For implementing the time synchronization method as described in any one of claims 1-8, the time synchronization device comprises: A reference signal synchronization module is used to synchronously transmit the reference signal to the NVH signal acquisition device and the CAN signal acquisition device in response to the reference signal; The NVH signal processing module is used to determine the target NVH signal and the characteristic reference signal based on the NVH signal and the reference signal acquired by the NVH signal acquisition device, and to obtain the time difference between the characteristic reference signal and the target NVH signal based on the NVH signal acquisition device. The reference time determination module is used to determine a reference time based on the CAN signal acquisition device according to the time difference and the characteristic reference signal acquired by the CAN signal acquisition device. The CAN signal processing module is used to obtain a target CAN signal that is time-synchronized with the target NVH signal from the signal acquired by the CAN signal acquisition device, at least according to the reference time.

10. The time synchronization device as described in claim 9, characterized in that, The reference signal is generated by an accelerometer fixed to a moving part associated with the component under test; The reference signal synchronization module is connected via a CAN bus to the NVH signal acquisition device for acquiring the NVH signal of the component under test and the CAN signal acquisition device for acquiring the CAN signal of the component under test.

11. An electronic device, characterized in that, include: processor; A memory, wherein executable instructions are stored; When the executable instructions are executed by the processor, they implement the time synchronization method for NVH signals and CAN signals as described in any one of claims 1-8.

12. A computer-readable storage medium for storing a program, characterized in that, When the program is executed by the processor, it implements the time synchronization method for NVH signals and CAN signals as described in any one of claims 1-8.

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