Torsional vibration control method and device for rear main reduction input shaft of rear-drive passenger vehicle under whole vehicle state

Abstract

This application relates to the field of torsional vibration technology in automotive powertrains, and particularly to a method and device for controlling torsional vibration of the rear main reducer input shaft in a rear-wheel-drive passenger vehicle under full vehicle conditions. The method includes: placing a target prototype vehicle in a low-noise four-wheel-drive rotating test chamber; arranging multiple sensors and multi-channel data acquisition instruments on the target prototype vehicle according to the requirements of the target project; starting the rotating system under target operating conditions and collecting signals such as speed, torque, vibration, and noise; processing these signals using NVH analysis software to extract the amplitude and order characteristics of the rear main reducer input shaft torsional vibration, and then analyzing the correlation between torsional vibration and vibration / noise; based on whether the two correlations meet the standards, if the torque value does not meet the standards, selecting a torsional damper with a suitable frequency and installing it on the target prototype vehicle, and iteratively executing the aforementioned process until the torque value meets the standards to generate a formal test report. This solves the problems of insufficient accuracy, poor repeatability, low efficiency, and delayed optimization in existing testing methods.

Description

Technical Field

[0001] This application relates to the field of torsional vibration technology for automotive transmission systems, and in particular to a method and device for controlling the torsional vibration of the rear main reduction input shaft of a rear-wheel drive passenger vehicle under full vehicle conditions, based on a low-noise four-wheel drive rotating hub test chamber. Background Technology

[0002] Torsional vibration in automotive drivetrains is a core issue affecting the overall NVH (noise, vibration, and harshness) performance and fatigue durability of vehicles, especially rear-wheel-drive luxury passenger cars, where the risk of torsional vibration is more pronounced due to the long powertrain chain and redundant components. Currently, industry testing methods for drivetrain torsional vibration are mainly divided into two categories: road vehicle testing and bench subsystem testing. Control measures primarily rely on additional vibration damping devices. Low-noise rotary drum test chambers are gradually becoming the core scenario for vehicle NVH testing. The background noise of a four-wheel-drive rotary drum semi-anechoic chamber can be as low as 25 dB(A), used for powertrain noise assessment.

[0003] In existing testing technologies, road vehicle testing analyzes torsional vibration characteristics by collecting transmission system speed and vibration signals under actual road conditions. However, this method is susceptible to interference from environmental noise, road surface consistency, and weather conditions, resulting in poor repeatability of test results. Research by the China Automotive Technology and Research Center (CATARC) indicates that environmental noise and wind noise during road testing can mask the torsional vibration signals of the transmission system itself, leading to inaccurate problem identification. Bench testing often employs component-level or semi-vehicle benches, such as testing the driveshaft and main reducer separately. While this can eliminate some interference, it cannot replicate the component coupling effects under full vehicle assembly conditions, resulting in discrepancies with actual operating conditions. FAW Group's publicly disclosed vehicle transmission system testing method (publication number CN121431091A) detects transmission system clearance by applying torque in different directions and collecting resolver signals. While this improves detection accuracy, it only addresses the clearance of the motor transmission system and does not involve torsional vibration testing of the rear main reducer input shaft, nor does it include a corresponding closed-loop optimization scheme. The six-wheel drive rotary semi-anechoic chamber developed by China Merchants Automotive Research Institute can achieve whole-vehicle NVH testing, but the existing solution does not have a dedicated testing process for the key node of the rear main reduction input shaft of rear-wheel drive passenger vehicles. The sensor layout and operating condition settings lack specificity and it is difficult to capture weak torsional vibration signals.

[0004] In terms of control technology, the industry generally adopts the method of adding torsional vibration dampers to the drive shaft or clutch end, such as flexible couplings and silicone oil vibration dampers, to suppress torsional vibration by changing the system's natural frequency. However, existing control solutions are mostly remedial measures after problems are discovered during mass production, that is, vibration damping devices are added after problems are discovered, ignoring torsional vibration identification and optimization in the early stages of development.

[0005] In summary, existing technologies suffer from the following significant drawbacks: First, insufficient testing accuracy. Testing outside the vehicle's condition cannot reflect true torsional vibration characteristics, and environmental interference leads to signal distortion. While traditional rotary drum testing chambers can reduce noise, they lack dedicated testing procedures, resulting in insufficient accuracy. Second, low testing efficiency. Road testing and traditional bench testing have long cycles, making it difficult to meet the rapid optimization needs of the first-round prototype vehicles. Third, lagging control. Later-stage development requires structural design changes, which are time-consuming, costly, and prone to triggering cascading performance issues. The core reason is that existing technologies have not constructed an integrated solution of "accurate vehicle-state testing - early identification - closed-loop optimization," resulting in a disconnect between testing and control. Furthermore, the drivetrain of rear-wheel-drive luxury passenger vehicles is complex, with variable torsional vibration transmission paths, making early identification difficult. For rear-wheel-drive luxury passenger vehicles, improper torsional vibration control can lead to significant NVH risks. For example, low-frequency booming noise can intrude into the cabin, compromising quietness, and shift shock can exacerbate driving discomfort, which aligns with BAIC Huansu's NVH performance control logic. Simultaneously, alternating torsional stress can exacerbate fatigue damage to the rear main reduction gear and driveshaft universal joint, causing pitting on the gear teeth and shaft fracture. If second-order torsional vibration in the engine is not suppressed, the fatigue life of transmission system components will be shortened by 30%-50%, significantly reducing the overall vehicle durability and reliability. Addressing these issues in the later stages of development requires coordinated adjustments to multiple components, with a design change cycle typically exceeding three months, resulting in a surge in R&D costs. Summary of the Invention

[0006] This application provides a method and device for controlling torsional vibration of the rear main reduction input shaft in the whole vehicle state of a rear-wheel drive passenger vehicle, in order to solve the problems of insufficient accuracy, poor repeatability, low testing efficiency, and delayed optimization in existing testing methods, as well as the difficulty in diagnosing first-order torsional vibration problems in the transmission system of rear-wheel drive passenger vehicles, high rectification costs, and the lack of specificity of existing control schemes.

[0007] The first aspect of this application provides a method for controlling the torsional vibration of the rear main reduction input shaft in a rear-wheel-drive passenger vehicle under full vehicle conditions, including the following steps: The target prototype vehicle was placed in a low-noise four-wheel drive rotating test chamber, and vibration sensors, noise sensors, torsional vibration sensors and multi-channel data acquisition instruments were arranged on the target prototype vehicle according to the requirements of the target project. Under the target operating conditions, the hub system in the low-noise four-wheel drive hub test chamber is activated to synchronously collect speed signals, torque signals, vibration signals and noise signals through the multi-channel data acquisition instrument; The speed signal, torque signal, vibration signal and noise signal are processed using NVH analysis software to extract the torsional vibration amplitude and order characteristics of the main input shaft. Based on the torsional vibration amplitude of the rear main input shaft and the order characteristics, analyze the first correlation between torsional vibration and vibration, and the second correlation between torsional vibration and noise; Based on the first correlation and the second correlation, it is determined whether the torque value meets the standard. If the torque value does not meet the standard, a torsional damper with a suitable frequency is selected and installed on the target prototype vehicle, and the aforementioned process is iteratively executed until the torque value meets the standard, so as to generate a formal test report.

[0008] Optionally, placing the target prototype vehicle in a low-noise four-wheel drive rotating test chamber and arranging vibration sensors, noise sensors, torsional vibration sensors, and multi-channel data acquisition instruments on the target prototype vehicle according to the requirements of the target project includes: The target prototype vehicle was placed in a low-noise four-wheel drive rotating test chamber. The vibration sensor was arranged on the drive shaft and rear main reduction housing of the target prototype vehicle, the noise sensor was arranged at the head of the driver and passenger, and the torsional vibration sensor was arranged at the connecting flange of the rear main reduction input shaft and the drive shaft. Connect the vibration sensor, the noise sensor, and the torsional vibration sensor to the data acquisition instrument.

[0009] Optionally, it also includes: Beforehand, check the tightness of the transmission system components in the low-noise four-wheel drive test chamber, add standard lubricating oil, preheat the engine to normal operating temperature, remove excess accessories from the vehicle body, and check the condition of the seat rails. The hub system, vibration sensor, noise sensor, torsional vibration sensor, and multi-channel data acquisition instrument in the low-noise four-wheel drive hub test chamber are calibrated in advance.

[0010] Optionally, the step of determining whether the torque value meets the standard based on the first correlation and the second correlation item, and if the torque value does not meet the standard, involves selecting a torsional damper with a suitable frequency and installing it on the target prototype vehicle, and iteratively executing the aforementioned process until the torque value meets the standard, to generate a formal test report, including: Determine whether the torque value meets the standard based on the first correlation and the second correlation item; If the torque value does not meet the standard, analyze whether a resonance point or an excess item is triggered. Select a torsional vibration damper with an appropriate frequency based on the resonance point or the excess item, and install the torsional vibration damper with the appropriate frequency on the target prototype vehicle. Iterate the above process until the torque value meets the standard to form a formal test report containing flowcharts, schematic diagrams, and data analysis reports.

[0011] A second aspect of this application provides a rear main reduction input shaft torsional vibration control device for a rear-wheel-drive passenger vehicle in its entirety state, comprising: The module is used to place the target prototype vehicle in a low-noise four-wheel drive rotating test chamber and to arrange vibration sensors, noise sensors, torsional vibration sensors and multi-channel data acquisition instruments on the target prototype vehicle according to the requirements of the target project. The signal acquisition module is used to start the hub system in the low-noise four-wheel drive hub test chamber under the target working condition, so as to synchronously acquire speed signal, torque signal, vibration signal and noise signal through the multi-channel data acquisition instrument; The signal processing module is used to process the speed signal, torque signal, vibration signal and noise signal using NVH analysis software to extract the torsional amplitude and order characteristics of the main input shaft. The correlation analysis module is used to analyze the first correlation between torsional vibration and vibration, and the second correlation between torsional vibration and noise, based on the torsional vibration amplitude of the rear main input shaft and the order characteristics. The iterative judgment module is used to determine whether the torque value meets the standard based on the first correlation and the second correlation item. If the torque value does not meet the standard, a torsional vibration damper with a suitable frequency is selected and installed on the target prototype vehicle, and the aforementioned process is iteratively executed until the torque value meets the standard to generate a formal test report.

[0012] Optionally, the arrangement module includes: The arrangement unit is used to place the target prototype vehicle in a low-noise four-wheel drive rotating test chamber. The vibration sensor is arranged on the drive shaft and rear main reduction housing of the target prototype vehicle, the noise sensor is arranged at the head of the driver and passenger, and the torsional vibration sensor is arranged at the connecting flange of the rear main reduction input shaft and the drive shaft. A connection unit is used to connect the vibration sensor, the noise sensor, the torsional vibration sensor, and the data acquisition instrument.

[0013] Optionally, it also includes: The first pre-processing module is used to pre-check the assembly tightness of the transmission system components in the low-noise four-wheel drive rotating test chamber, add standard lubricating oil, preheat the engine to normal operating temperature, remove excess accessories from the vehicle body, and check the condition of the seat rails. The second preprocessing module is used to pre-calibrate the hub system, vibration sensor, noise sensor, torsional vibration sensor and multi-channel data acquisition instrument in the low-noise four-wheel drive hub test chamber.

[0014] Optionally, the iterative judgment module includes: The judgment unit is used to determine whether the torque value meets the standard based on the first correlation and the second correlation item; The iterative unit is used to analyze whether a resonance point or an excess item is triggered when the torque value does not meet the standard. Based on the resonance point or the excess item, a torsional vibration damper with an appropriate frequency is selected, and the torsional vibration damper with the appropriate frequency is installed on the target prototype vehicle. The aforementioned process is iteratively executed until the torque value meets the standard, so as to generate a formal test report containing a flowchart, schematic diagram, and data analysis report.

[0015] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the rear main axle torsional vibration control method for a rear-wheel-drive passenger vehicle in the overall vehicle state as described in the above embodiments.

[0016] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described rear main axle torsional vibration control method for a rear-wheel-drive passenger vehicle in its overall vehicle state.

[0017] The rear main reduction gear input shaft torsional vibration control method and device proposed in this application for rear-wheel drive passenger vehicles under full vehicle conditions are based on a low-noise four-wheel drive rotary test chamber and combined with a dedicated sensor layout scheme. This effectively isolates environmental and wind noise interference and can accurately capture weak torsional vibration signals of the rear main reduction gear input shaft. The full vehicle condition test restores the component coupling effect, and the test data is more than 90% consistent with the actual vehicle conditions. The closed-loop optimization process tests and analyzes torsional vibration, and torsional vibration optimization can be completed in the first round of prototype stage, avoiding later structural design changes and reducing the number of prototype iterations. By precisely controlling the torsional vibration of the rear main reduction gear input shaft, shift shock and driving roar are eliminated, improving the comfort of rear-wheel drive luxury passenger vehicles and avoiding risks such as gear surface damage and shaft breakage. The standardized testing process and clear vibration reduction optimization scheme do not require high-level professional skills and can be implemented by ordinary technicians step by step, lowering the technical threshold.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a rear main reducer input shaft torsional vibration control method for a rear-wheel drive passenger vehicle in a complete vehicle state, according to an embodiment of this application. Figure 2 This is a schematic diagram illustrating the specific execution of a rear main reduction input shaft torsional vibration control method for a rear-wheel drive passenger vehicle in a complete vehicle state, according to an embodiment of this application. Figure 3 This is a schematic diagram of a torsional vibration target according to an embodiment of this application; Figure 4 This is a schematic diagram showing the location of the vibration measurement point between the rear main reducer housing and the intermediate support of the drive shaft, according to an embodiment of this application. Figure 5This is a schematic diagram of a driver's seat guide rail vibration and microphone arrangement according to an embodiment of this application; Figure 6 is a schematic diagram of a magnet bonding method according to an embodiment of this application; Figure 7 This is a block diagram of a rear main reduction input shaft torsional vibration control device for a rear-wheel drive passenger vehicle in its overall vehicle state, according to an embodiment of this application. Figure 8 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 70-Rear drive passenger vehicle rear main reduction input shaft torsional vibration control device in whole vehicle state, 701-Layout module, 702-Signal acquisition module, 703-Signal processing module, 704-Correlation analysis module, 705-Iterative judgment module, 801-Memory, 802-Processor, 803-Communication interface. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0022] The following description, with reference to the accompanying drawings, describes a method and apparatus for controlling torsional vibration of the rear main reduction input shaft in a fully-equipped rear-wheel-drive passenger vehicle. Addressing the issues of insufficient accuracy, poor repeatability, low testing efficiency, and delayed optimization in existing testing methods mentioned in the background section, and the difficulties in identifying and addressing the high costs of rectification for first-order torsional vibration problems in the powertrain of rear-wheel-drive passenger vehicles, as well as the lack of specificity in existing control schemes, this application provides a method for controlling torsional vibration of the rear main reduction input shaft in a fully-equipped rear-wheel-drive passenger vehicle. This method solves the problems of insufficient accuracy and poor repeatability in existing testing methods, enabling accurate testing of the torsional vibration of the rear main reduction input shaft in a fully-equipped rear-wheel-drive passenger vehicle, eliminating environmental interference and component coupling deviations; it also solves the problems of low testing efficiency and delayed optimization, constructing a rapid testing and closed-loop optimization process adapted to the first-round prototype vehicle, shortening the development cycle; it addresses the difficulties in identifying and addressing the high costs of rectification for first-order torsional vibration problems in the powertrain of rear-wheel-drive passenger vehicles, enabling early identification and control of torsional vibration risks; and it addresses the lack of specificity in existing control schemes, forming a dedicated vibration reduction optimization scheme centered on the rear main reduction input shaft.

[0023] Specifically, Figure 1 This is a flowchart illustrating a method for controlling the torsional vibration of the rear main reduction input shaft in a rear-wheel-drive passenger vehicle under vehicle conditions, as provided in an embodiment of this application.

[0024] like Figure 1As shown, the rear main reduction input shaft torsional vibration control method for this rear-wheel drive passenger vehicle in its overall vehicle state includes the following steps: In step S101, the target prototype vehicle is placed in a low-noise four-wheel drive rotating test chamber, and vibration sensors, noise sensors, torsional vibration sensors and multi-channel data acquisition instruments are arranged on the target prototype vehicle according to the requirements of the target project.

[0025] In some embodiments, it also includes: Beforehand, check the tightness of the transmission system components in the low-noise four-wheel drive test chamber, add standard lubricating oil, preheat the engine to normal operating temperature, remove unnecessary accessories from the vehicle body, and check the condition of the seat rails. The hub system, vibration sensor, noise sensor, torsional vibration sensor, and multi-channel data acquisition instrument in the low-noise four-wheel drive hub test chamber were calibrated in advance.

[0026] In some embodiments, the target prototype vehicle is placed in a low-noise four-wheel drive rotating test chamber, and vibration sensors, noise sensors, torsional vibration sensors, and multi-channel data acquisition instruments are arranged on the target prototype vehicle according to the requirements of the target project, including: The target prototype vehicle was placed in a low-noise four-wheel drive rotating test chamber. Vibration sensors were placed on the drive shaft and rear main reduction housing of the target prototype vehicle, noise sensors were placed on the head of the driver and passengers, and torsional vibration sensors were placed at the connecting flange of the rear main reduction input shaft and the drive shaft. Connect the vibration sensor, noise sensor, and torsional vibration sensor to the data acquisition instrument.

[0027] In actual implementation, such as Figure 2 As shown, it is necessary to clearly define the test object (rear-wheel drive passenger vehicle model, powertrain parameters), development stage (first-round prototype), core test requirements (rear main reduction gear input shaft torsional vibration amplitude, order characteristics), and vehicle assembly status requirements in advance, and confirm the schematic diagram simultaneously. Figure 2 The location of components and reserved sensor points are determined to ensure that the test vehicle matches the prototype structure. An engineering prototype is obtained, and its condition is checked. The check items include the prototype status of the whole vehicle components (formal parts, hand-borrowed parts, etc.), the calibration parameters of the whole vehicle (transmission, engine speed and torque, etc.), and the recording of information such as prototype number, model, vehicle identification number, rated power and torque of engine / drive motor, transmission model, drive type, and overall vehicle weight and passenger capacity. The vehicle should ensure that the safety system, hydraulic system, electrical and mechanical system are in a safe condition, and the tire inflation pressure is at the design state.

[0028] For passenger vehicle development, based on project inputs and schematic diagram annotations, formulate testing procedures, sensor placement specifications (corresponding to reserved positions in the schematic diagram), operating parameters, and data judgment standards, and clarify the testing cycle and personnel division of labor; the outline should include torsional vibration signal acquisition frequency, data analysis methods, and vibration damper selection principles to guide on-site operations.

[0029] As shown in Figure 3, the prototype vehicle was placed in a low-noise four-wheel drive rotary test chamber to check the tightness of the powertrain components and ensure that the rear main reduction gear, drive shaft, and gearbox were properly connected (bolt torque met technical requirements, and spline connections were free of jamming). Standard specification lubricating oil was added, and the engine was preheated to normal operating temperature (80-90℃). Excess accessories on the vehicle body were removed, and the seat guide rails were checked against the seat diagram to ensure that there were no foreign objects causing jamming and that the sliding was smooth to avoid interfering with the test signals.

[0030] Prepare a low-noise four-wheel drive hub system, ≥8-channel data acquisition instruments, torsional vibration sensors, three-dimensional acceleration sensors, free-field microphones, and sensor fixtures, and calibrate all equipment in advance; also, 2 test operators (familiar with hub system) and 1 data analyst (proficient in NVH data processing) are required, all of whom must pass equipment operation and safety training.

[0031] according to Figure 4 As shown in Figure 6, the vibration sensor uses a triaxial accelerometer. The triaxial vibration accelerometer is positioned at the intermediate support location of the driveshaft and at the rear main reduction gear housing location. Taking a passenger vehicle with a two-section driveshaft as an example, the sensor placement locations are shown below. Figure 4 The orientation is referenced to the vehicle's coordinate system. Vibration sensors collect vibration signals; noise sensors are placed near the driver's ear (side of the headrest) and above the rear passengers' heads (above the seats), using free-field microphones, and the sensors are connected in series with the data acquisition instrument. A torsional vibration sensor is designed, which is made using a tape measure with single-sided adhesive, with a 2mm diameter magnet attached every 2mm on the tape measure's scale side.

[0032] In step S102, under the target operating condition, the swivel system in the low-noise four-wheel drive swivel test chamber is started to synchronously acquire speed signals, torque signals, vibration signals and noise signals through a multi-channel data acquisition instrument.

[0033] In actual implementation, such as Figure 4 As shown, a ring-shaped code strip is pasted at the flange connecting the rear main reduction input shaft and the drive shaft. The speed sensor is aligned with the magnetic code strip through a proximity switch. The distance between the sensor and the code strip is controlled at 2-4mm. A special tooling is used for fixing (to avoid vibration displacement). The sensor output is connected to a data acquisition instrument to collect pulse (speed) fluctuation signals in real time and convert them into torsional vibration data.

[0034] Furthermore, using a vehicle-on-hub mode, the hub-and-spoke system was activated and operated according to the set test conditions (as shown in Table 1 below). Engine speed, vehicle speed, driveshaft speed, engine torque, vibration, and noise signals were simultaneously collected using data acquisition instruments at a frequency ≥2048Hz to avoid signal aliasing. During the test, the vehicle's status was monitored (no abnormal noises from the transmission system, no vibration interference from the seat rails) to prevent abnormal component wear. The torsional signal sampling frequency was no less than 25600Hz.

[0035] Table 1 Test conditions (taking 9AMT automatic transmission as an example)

[0036] In step S103, NVH analysis software is used to process the speed signal, torque signal, vibration signal and noise signal to extract the torsional amplitude and order characteristics of the input shaft of the main reducer.

[0037] In step S104, the first correlation between torsional vibration and vibration, and the second correlation between torsional vibration and noise are analyzed based on the amplitude and order characteristics of the torsional vibration of the rear main input shaft.

[0038] In step S105, the torque value is determined based on the first correlation and the second correlation. If the torque value does not meet the standard, a torsional damper with a suitable frequency is selected and installed on the target prototype vehicle. The aforementioned process is iteratively executed until the torque value meets the standard, so as to generate a formal test report.

[0039] In some embodiments, the torque value is determined based on the first correlation and the second correlation term. If the torque value does not meet the standard, a torsional damper with a suitable frequency is selected and installed on the target prototype vehicle, and the aforementioned process is iteratively executed until the torque value meets the standard, in order to generate a formal test report, including: Determine whether the torque value meets the standard based on the first correlation and the second correlation term; If the torque value does not meet the standard, analyze whether it causes resonance points or exceedances. Select a torsional damper with a suitable frequency based on the resonance points or exceedances, install the torsional damper with the suitable frequency on the target prototype vehicle, and iteratively execute the above process until the torque value meets the standard, so as to form a formal test report containing flowcharts, schematic diagrams, and data analysis reports.

[0040] In actual implementation, NVH analysis software is used to process speed, torque, vibration, and noise signals to extract the torsional vibration amplitude and order characteristics of the main reducer input shaft. This, combined with sensor placement, allows for analysis of the primary and secondary correlations between torsional vibration and noise / vibration, determining the presence of resonance points and out-of-range items. If the torsional vibration signal ≥ Figure 3 The target line needs to be optimized until the target is met, and finally a data analysis report is generated.

[0041] If the torsional vibration parameters meet the set targets, close the test and generate a test report (with flowchart, schematic diagram, and data analysis report); if not, optimize the excitation, path, and response, prioritizing the selection of a torsional vibration damper with a suitable frequency, referring to the transmission system schematic. Figure 3 The damper is fixed to the input shaft end of the rear main reducer via a flange. The inner ring of the damper is interference-fitted with the input shaft, while the outer ring is flexibly connected to the drive shaft. The hysteresis damping characteristics of the rubber layer are used to dissipate torsional vibration energy. After installation, the above process is repeated until the torsional vibration parameters meet the standards. The optimization results of each round are marked at the corresponding node in the flowchart, forming a closed-loop record.

[0042] Finally, by controlling the torsional vibration of the transmission system during the process, the overall vehicle vibration and noise performance is optimized, ultimately providing a reference for the optimization of the final product vehicle.

[0043] In summary, the rear main reduction input shaft torsional vibration control method for rear-wheel drive passenger vehicles proposed in the embodiments of this application has the following beneficial effects: (1) Significantly improved test accuracy: Based on the low-noise four-wheel drive rotating test chamber and combined with the exclusive sensor layout scheme, the environment and wind noise interference are effectively isolated, and the weak torsional vibration signal of the rear main reduction input shaft can be accurately captured; the whole vehicle state test restores the component coupling effect, and the test data is more than 90% consistent with the actual vehicle working conditions.

[0044] (2) Significantly improved development efficiency: The closed-loop optimization process will test and analyze torsional vibration, and torsional vibration optimization can be completed in the first round of prototype stage, avoiding structural changes in the later stage and reducing the number of prototype iterations.

[0045] (3) Improved overall vehicle performance and durability: By precisely controlling the torsional vibration of the rear main reduction input shaft, the shift shock and driving noise are eliminated, improving the comfort of the rear-wheel drive luxury passenger car and avoiding risks such as tooth surface damage and shaft breakage.

[0046] (4) Highly convenient to operate: The standardized testing process and clear vibration reduction optimization scheme do not require high-level professional skills. Ordinary technicians can implement it step by step, thus reducing the technical threshold.

[0047] Next, referring to the accompanying drawings, a rear main reduction input shaft torsional vibration control device for a rear-wheel drive passenger vehicle in the overall vehicle state, according to an embodiment of this application, is described.

[0048] Figure 7 This is a block diagram of a rear main reduction input shaft torsional vibration control device for a rear-wheel drive passenger vehicle in its overall vehicle state, as provided in an embodiment of this application.

[0049] like Figure 7As shown, the rear main reduction input shaft torsional vibration control device 70 of the rear-wheel drive passenger vehicle in the whole vehicle state includes: a layout module 701, a signal acquisition module 702, a signal processing module 703, a correlation analysis module 704, and an iterative judgment module 705.

[0050] The module 701 is used to place the target prototype vehicle in a low-noise four-wheel drive rotary test chamber, and to arrange vibration sensors, noise sensors, torsional vibration sensors, and multi-channel data acquisition instruments on the target prototype vehicle according to the requirements of the target project. The signal acquisition module 702 is used to start the rotary system in the low-noise four-wheel drive rotary test chamber under the target operating conditions, so as to synchronously acquire speed signals, torque signals, vibration signals, and noise signals through the multi-channel data acquisition instruments. The signal processing module 703 is used to process the speed signals, torque signals, vibration signals, and noise signals using NVH analysis software to extract the torsional vibration amplitude and order characteristics of the rear main reduction input shaft. The correlation analysis module 704 is used to analyze the first correlation between torsional vibration and general vibration, and the second correlation between torsional vibration and noise based on the torsional vibration amplitude and order characteristics of the rear main reduction input shaft. The iterative judgment module 705 is used to determine whether the torque value meets the standard based on the first correlation and the second correlation. If the torque value does not meet the standard, a torsional damper with a suitable frequency is selected and installed on the target prototype vehicle, and the aforementioned process is iteratively executed until the torque value meets the standard in order to generate a formal test report.

[0051] In some embodiments, the arrangement module 701 includes: The arrangement unit is used to place the target prototype vehicle in a low-noise four-wheel drive rotating test chamber. Vibration sensors are arranged on the drive shaft and rear main reduction housing of the target prototype vehicle, noise sensors are arranged on the head of the driver and passengers, and torsional vibration sensors are arranged at the connecting flange of the rear main reduction input shaft and the drive shaft. The connection unit is used to connect vibration sensors, noise sensors, torsional vibration sensors and data acquisition instruments.

[0052] In some embodiments, it also includes: The first pre-processing module is used to pre-check the assembly tightness of the transmission system components in the low-noise four-wheel drive rotating test chamber, add standard lubricating oil, preheat the engine to normal operating temperature, remove excess accessories from the vehicle body, and check the condition of the seat rails. The second preprocessing module is used to pre-calibrate the hub system, vibration sensor, noise sensor, torsional vibration sensor and multi-channel data acquisition instrument in the low-noise four-wheel drive hub test chamber.

[0053] In some embodiments, the iterative determination module 705 includes: The judgment unit is used to determine whether the torque value meets the standard based on the first correlation and the second correlation term. The iterative unit is used to analyze whether resonance points or out-of-range items are triggered when the torque value does not meet the standard. Based on the resonance points or out-of-range items, a torsional vibration damper with a suitable frequency is selected, and the torsional vibration damper with the suitable frequency is installed on the target prototype vehicle. The aforementioned process is iteratively executed until the torque value meets the standard, so as to generate a formal test report containing flowcharts, schematic diagrams, and data analysis reports.

[0054] It should be noted that the foregoing explanation of the embodiment of the rear main reduction input shaft torsional vibration control method in the whole vehicle state of a rear-wheel drive passenger vehicle also applies to the rear main reduction input shaft torsional vibration control device in the whole vehicle state of the rear-wheel drive passenger vehicle in this embodiment, and will not be repeated here.

[0055] The rear main reduction input shaft torsional vibration control method for rear-wheel drive passenger vehicles in the overall vehicle state proposed in this application has the following beneficial effects: (1) Significantly improved test accuracy: Based on the low-noise four-wheel drive rotating test chamber and combined with the exclusive sensor layout scheme, the environment and wind noise interference are effectively isolated, and the weak torsional vibration signal of the rear main reduction input shaft can be accurately captured; the whole vehicle state test restores the component coupling effect, and the test data is more than 90% consistent with the actual vehicle working conditions.

[0056] (2) Significantly improved development efficiency: The closed-loop optimization process will test and analyze torsional vibration, and torsional vibration optimization can be completed in the first round of prototype stage, avoiding structural changes in the later stage and reducing the number of prototype iterations.

[0057] (3) Improved overall vehicle performance and durability: By precisely controlling the torsional vibration of the rear main reduction input shaft, the shift shock and driving noise are eliminated, improving the comfort of the rear-wheel drive luxury passenger car and avoiding risks such as tooth surface damage and shaft breakage.

[0058] (4) Highly convenient to operate: The standardized testing process and clear vibration reduction optimization scheme do not require high-level professional skills. Ordinary technicians can implement it step by step, thus reducing the technical threshold.

[0059] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0060] The electronic device may include: a memory 801, a processor 802, and a computer program stored on the memory 801 and capable of running on the processor 802.

[0061] When the processor 802 executes the program, it implements the rear main reduction input shaft torsional vibration control method provided in the above embodiments under the whole vehicle state of a rear-wheel drive passenger vehicle.

[0062] Furthermore, electronic devices also include: Communication interface 803 is used for communication between memory 801 and processor 802.

[0063] The memory 801 is used to store computer programs that can run on the processor 802.

[0064] The memory 801 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0065] If the memory 801, processor 802, and communication interface 803 are implemented independently, then the communication interface 803, memory 801, and processor 802 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized into address buses, data buses, control buses, etc. For ease of representation, Figure 8 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0066] Optionally, in a specific implementation, if the memory 801, processor 802, and communication interface 803 are integrated on a single chip, then the memory 801, processor 802, and communication interface 803 can communicate with each other through an internal interface.

[0067] The processor 802 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0068] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described rear main axle torsional vibration control method for a rear-wheel-drive passenger vehicle in its overall vehicle state.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0072] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0073] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0074] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0075] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0076] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A rear drive passenger car whole vehicle state rear main reduction input shaft torsional vibration control method, characterized by, Includes the following steps: The target prototype vehicle was placed in a low-noise four-wheel drive rotating test chamber, and vibration sensors, noise sensors, torsional vibration sensors and multi-channel data acquisition instruments were arranged on the target prototype vehicle according to the requirements of the target project. Under the target operating conditions, the hub system in the low-noise four-wheel drive hub test chamber is activated to synchronously collect speed signals, torque signals, vibration signals and noise signals through the multi-channel data acquisition instrument; The speed signal, torque signal, vibration signal and noise signal are processed using NVH analysis software to extract the torsional vibration amplitude and order characteristics of the main input shaft. Based on the torsional vibration amplitude of the rear main input shaft and the order characteristics, analyze the first correlation between torsional vibration and vibration, and the second correlation between torsional vibration and noise; Based on the first correlation and the second correlation, it is determined whether the torque value meets the standard. If the torque value does not meet the standard, a torsional damper with a suitable frequency is selected and installed on the target prototype vehicle, and the aforementioned process is iteratively executed until the torque value meets the standard, so as to generate a formal test report.

2. The rear drive passenger car vehicle state rear main reduction input shaft torsional vibration control method according to claim 1, characterized by, The process involves placing the target prototype vehicle in a low-noise four-wheel drive rotating test chamber, and arranging vibration sensors, noise sensors, torsional vibration sensors, and multi-channel data acquisition instruments on the target prototype vehicle according to the requirements of the target project. This includes: The target prototype vehicle was placed in a low-noise four-wheel drive rotating test chamber. The vibration sensor was arranged on the drive shaft and rear main reduction housing of the target prototype vehicle, the noise sensor was arranged at the head of the driver and passenger, and the torsional vibration sensor was arranged at the connecting flange of the rear main reduction input shaft and the drive shaft. Connect the vibration sensor, the noise sensor, and the torsional vibration sensor to the data acquisition instrument.

3. The rear drive passenger car vehicle state rear main reduction input shaft torsional vibration control method according to claim 1, characterized by, Also includes: Beforehand, check the tightness of the transmission system components in the low-noise four-wheel drive test chamber, add standard lubricating oil, preheat the engine to normal operating temperature, remove excess accessories from the vehicle body, and check the condition of the seat rails. The hub system, vibration sensor, noise sensor, torsional vibration sensor, and multi-channel data acquisition instrument in the low-noise four-wheel drive hub test chamber are calibrated in advance.

4. The rear drive passenger car vehicle state rear main reduction input shaft torsional vibration control method according to claim 1, characterized by, The process involves determining whether the torque value meets the standard based on the first and second correlation terms. If the torque value does not meet the standard, a torsional damper with a suitable frequency is selected and installed on the target prototype vehicle. The aforementioned process is iteratively executed until the torque value meets the standard, thereby generating a formal test report, including: Determine whether the torque value meets the standard based on the first correlation and the second correlation item; If the torque value does not meet the standard, analyze whether a resonance point or an excess item is triggered. Select a torsional vibration damper with an appropriate frequency based on the resonance point or the excess item, and install the torsional vibration damper with the appropriate frequency on the target prototype vehicle. Iterate the above process until the torque value meets the standard to form a formal test report containing flowcharts, schematic diagrams, and data analysis reports.

5. A rear drive passenger car vehicle state rear main reduction input shaft torsional vibration control device, characterized by, include: The module is used to place the target prototype vehicle in a low-noise four-wheel drive rotating test chamber and to arrange vibration sensors, noise sensors, torsional vibration sensors and multi-channel data acquisition instruments on the target prototype vehicle according to the requirements of the target project. The signal acquisition module is used to start the hub system in the low-noise four-wheel drive hub test chamber under the target working condition, so as to synchronously acquire speed signal, torque signal, vibration signal and noise signal through the multi-channel data acquisition instrument; The signal processing module is used to process the speed signal, torque signal, vibration signal and noise signal using NVH analysis software to extract the torsional amplitude and order characteristics of the main input shaft. The correlation analysis module is used to analyze the first correlation between torsional vibration and vibration, and the second correlation between torsional vibration and noise, based on the torsional vibration amplitude of the rear main input shaft and the order characteristics. The iterative judgment module is used to determine whether the torque value meets the standard based on the first correlation and the second correlation item. If the torque value does not meet the standard, a torsional vibration damper with a suitable frequency is selected and installed on the target prototype vehicle, and the aforementioned process is iteratively executed until the torque value meets the standard to generate a formal test report.

6. The rear drive passenger car vehicle state rear main reduction input shaft torsional vibration control device according to claim 5, characterized by, The arrangement module includes: The arrangement unit is used to place the target prototype vehicle in a low-noise four-wheel drive rotating test chamber. The vibration sensor is arranged on the drive shaft and rear main reduction housing of the target prototype vehicle, the noise sensor is arranged at the head of the driver and passenger, and the torsional vibration sensor is arranged at the connecting flange of the rear main reduction input shaft and the drive shaft. A connection unit is used to connect the vibration sensor, the noise sensor, the torsional vibration sensor, and the data acquisition instrument.

7. The rear drive passenger car vehicle state rear main reduction input shaft torsional vibration control device according to claim 5, characterized by, Also includes: The first pre-processing module is used to pre-check the assembly tightness of the transmission system components in the low-noise four-wheel drive rotating test chamber, add standard lubricating oil, preheat the engine to normal operating temperature, remove excess accessories from the vehicle body, and check the condition of the seat rails. The second preprocessing module is used to pre-calibrate the hub system, vibration sensor, noise sensor, torsional vibration sensor and multi-channel data acquisition instrument in the low-noise four-wheel drive hub test chamber.

8. The rear drive passenger car vehicle state rear main reduction input shaft torsional vibration control device according to claim 5, characterized by, The iterative judgment module includes: The judgment unit is used to determine whether the torque value meets the standard based on the first correlation and the second correlation item; The iterative unit is used to analyze whether a resonance point or an excess item is triggered when the torque value does not meet the standard. Based on the resonance point or the excess item, a torsional vibration damper with an appropriate frequency is selected, and the torsional vibration damper with the appropriate frequency is installed on the target prototype vehicle. The aforementioned process is iteratively executed until the torque value meets the standard, so as to generate a formal test report containing a flowchart, schematic diagram, and data analysis report.

9. An electronic device, comprising: include: The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the rear main axle torsional vibration control method for a rear-wheel-drive passenger vehicle in a fully functional state as described in any one of claims 1-4.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the rear main reduction input shaft torsional vibration control method for a rear-wheel drive passenger vehicle in the overall vehicle state as described in any one of claims 1-4.

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