Driving shaft deceleration sliding abnormal sound detection system and method

Abstract

The invention relates to a driving shaft deceleration sliding abnormal sound detection system and method. The system comprises a driving device, a torque sensor, a speed sensor, a first chuck, a sound sensor, an angle ruler, a sliding table, a swing table, a second chuck, a load box and a control terminal. The driving device is in transmission connection with the first chuck, and the first chuck is also used for being connected with a movable joint of a tested driving shaft; the torque sensor and the speed sensor are mounted on a power transmission path of the first chuck and the driving device and are respectively connected with the control terminal; the second chuck is used for being connected with a fixed joint of a tested driving shaft, the sliding table and the swing table are connected with the second chuck, and the bevel protractor is connected with the second chuck; the load box is connected with the second chuck; the control terminal is connected with the driving device and used for simulating the whole vehicle deceleration sliding working condition. The sound sensor is connected with the control terminal. The method is suitable for driving shaft abnormal sound detection under the condition of new energy automobile deceleration sliding energy recovery.

Description

Technical Field

[0001] The present invention relates to the technical field of drive shaft testing, and in particular to a system and method for detecting abnormal noise during deceleration and sliding of a drive shaft. Background Art

[0002] As a core component of the vehicle's chassis powertrain, the driveshaft plays a crucial role in driving. It connects the differential to the drive wheels, accurately and efficiently transmitting torque from the electric drive to the wheels, thereby driving the vehicle smoothly and flexibly. Whether it's a fuel-powered or new energy vehicle, the stable performance of the driveshaft directly impacts the vehicle's power transmission efficiency and driving safety.

[0003] With the booming development of the new energy vehicle industry, energy recovery systems have become standard technology in new energy vehicles to effectively reduce kinetic energy loss during deceleration or braking, thereby increasing the vehicle's range. This system allows the motor to quickly switch from drive mode to generator mode when the vehicle decelerates or brakes, recovering and reusing energy. However, this innovative technology also introduces new operating challenges for the driveshaft. Compared to traditional fuel vehicles, the driveshaft of new energy vehicles experiences a unique operating condition during the energy recovery phase—positive rotation with negative torque. This condition complicates and diversifies the forces and motions of the driveshaft.

[0004] In actual use, the grease performance of the driveshaft's fixed joints is significantly affected by high-speed, high-torque conditions. This manifests itself in decreased grease viscosity and reduced wear resistance. These changes can lead to a new failure mode in the driveshaft. When the vehicle's accelerator is released and coasting, the energy recovery system exerts positive negative torque on the driveshaft, causing the fixed joint ball cage to periodically produce abnormal noise. This noise not only affects driving comfort but can also be an early sign of a potential driveshaft failure. If not detected and addressed promptly, it can lead to more serious safety issues.

[0005] Currently, the industry lacks relevant regulations or testing standards for abnormal drive shaft noise. Existing testing methods primarily rely on high-mileage reliability road tests of complete vehicles or aftermarket verification. However, high-mileage reliability road tests require significant time, manpower, and material resources, and the testing cycle is long, often resulting in delayed problem detection. Aftermarket verification, on the other hand, is conducted after the product has been released to the market. Once a problem is discovered, the cost of corrective verification is extremely high, resulting in significant financial losses for the company and compromising its brand image and market competitiveness.

[0006] Existing devices and methods for testing drive shaft noise on a test bench also have limitations. For example, some methods primarily use a test bench to simulate the vehicle's rotation around a figure-eight curve to detect abnormal noise from the fixed joint ball cage. However, this simulated operating condition fails to capture the unique energy recovery conditions of new energy vehicles during coasting. Other methods primarily use a test bench to control the drive shaft's forward or reverse rotation to eliminate clearance within the drive shaft before performing abnormal noise testing. These methods focus on detecting whether the noise is caused by excessive circumferential clearance, and similarly fail to effectively simulate the new operating conditions of new energy vehicles.

[0007] In summary, a new drive shaft deceleration coasting abnormal noise detection system and method are developed. Summary of the Invention

[0008] The purpose of the present invention is to provide a drive shaft deceleration coasting abnormal noise detection system and method, which can be applied to the drive shaft abnormal noise detection under the deceleration coasting energy recovery condition of new energy vehicles.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows: In a first aspect, a drive shaft deceleration and coasting abnormal noise detection system according to the present invention includes a drive device, a torque sensor, a speed sensor, a first chuck, a sound sensor, an angle ruler, a slide and a swing table, a second chuck, a load box, and a control terminal; The driving device is in driving connection with the first chuck to transmit the power output by the driving device to the first chuck, and the first chuck is also used to connect with the moving joint of the drive shaft to be tested; The torque sensor and speed sensor are installed on the power transmission path between the first chuck and the driving device, and are respectively connected to the control terminal, for real-time monitoring of the torque and speed output by the driving device to the first chuck, and transmitting the monitoring data to the control terminal; The second chuck is used to be connected to the fixed joint of the drive shaft to be measured, the sliding table and the swing table are connected to the second chuck, and are used to pull the second chuck to slide along the axial direction of the drive shaft to be measured, and the angle ruler is connected to the second chuck, and is used to adjust the drive shaft to its layout angle on the vehicle; The load box is connected to the second chuck and is used to apply a load to the drive shaft under test; The control terminal is connected to the driving device to simulate the deceleration and coasting condition of the vehicle; The sound sensor is connected to the control terminal and is used for collecting abnormal sound data in real time and transmitting the data to the control terminal.

[0010] In one possible implementation, both the torque sensor and the speed sensor are mounted on the first chuck. Centrally mounting the torque and speed sensors on the first chuck reduces measurement errors that may arise from dispersed sensor installation locations within the power transmission path. This allows for more accurate acquisition of torque and speed data output by the drive unit to the first chuck, providing a reliable basis for subsequent accurate simulation of vehicle deceleration and coasting conditions and analysis of the drive shaft's status.

[0011] In one possible implementation, the load box includes a hydraulic system and a friction block, the hydraulic system being connected to the friction block. The hydraulic system applies a load to the drive shaft under test by controlling the clamping force between the friction block and the second chuck. Using the hydraulic system to control the clamping force between the friction block and the second chuck to apply the load allows for convenient and flexible adjustment of the load. By varying the pressure in the hydraulic system, the degree of clamping of the friction block on the second chuck can be precisely controlled, thereby applying varying loads to the drive shaft under test to meet the requirements of different testing conditions. This also enables a more realistic simulation of the load conditions experienced by the drive shaft during actual vehicle operation.

[0012] In one possible implementation, the sound sensor is a decibel meter, mounted above the fixed joint. A decibel meter is a device specifically designed to measure sound intensity. Using it as a sound sensor accurately captures data such as the decibel level of abnormal noise generated during the drive shaft's deceleration and coasting. Mounting it in this specific location above the fixed joint allows for closer proximity to the source of the abnormal noise, reducing interference from external noise and improving the accuracy of abnormal noise data collection.

[0013] In one possible implementation, the drive device is connected to the first chuck via a spline. This spline connection offers high transmission accuracy and reliability, ensuring stable and accurate transmission of power from the drive device to the first chuck, minimizing energy loss and vibration during power transmission and ensuring the entire detection system operates stably according to the specified operating conditions.

[0014] In one possible implementation, the movable joint and the first chuck are fixedly connected via a spline. This spline connection provides strong connection strength, ensuring that the movable joint and the first chuck do not slip or loosen relative to each other during testing, thereby ensuring continuous and stable power transmission. Furthermore, the spline connection offers high concentricity, ensuring the coaxiality of the movable joint and the first chuck, reducing additional vibration and error caused by inaccurate connection, and improving the accuracy of test results.

[0015] In one possible implementation, the fixed joint is fixedly connected to the second chuck via a spline. This spline connection allows the fixed joint to be stably fixed to the second chuck, ensuring that the drive shaft maintains the correct position and posture during the test process. This ensures that the slide, swing table, and angle ruler can accurately pull the second chuck for axial sliding and circumferential rotation, thereby adjusting the tested drive shaft to the correct test position and angle.

[0016] In a second aspect, a method for detecting abnormal noise during deceleration and coasting of a drive shaft according to the present invention uses the system for detecting abnormal noise during deceleration and coasting of a drive shaft according to the present invention, and the method comprises the following steps: Connect the movable section of the drive shaft to be tested to the first chuck, connect the fixed section of the drive shaft to be tested to the second chuck, and adjust the drive shaft to be tested to its state on the vehicle; The control terminal sets the torque loading and speed loading of the drive device to simulate the deceleration and coasting condition of the vehicle; The total time of torque loading and speed loading is one cycle, and the preset number of cycles is run; Data collection and display: the sound sensor collects noise data in real time and transmits it to the control terminal; The control terminal determines whether the drive shaft has a quality risk of abnormal noise during deceleration sliding based on the collected data.

[0017] In a possible implementation, the torque loading is specifically as follows: During the acceleration phase, positive torque is applied for a first preset time. During the constant speed phase, the torque is reduced to zero for a second preset time. During the deceleration phase, the torque is reduced to a negative torque for a third preset time and a fourth preset time. This torque loading method accurately simulates the actual torque changes during vehicle deceleration and coasting. Positive torque is applied during the acceleration phase to simulate vehicle acceleration, while the torque is reduced to zero during the constant speed phase to simulate constant speed driving. During the deceleration phase, the torque is reduced to a negative torque to simulate braking and deceleration.

[0018] In one possible implementation, the speed loading method is as follows: the acceleration phase increases from a standstill to the target speed and runs for a fifth preset time; the uniform speed phase maintains the target speed for a sixth preset time; and the deceleration phase reduces the speed to the first target value within a seventh preset time, then fluctuates at a preset amplitude and frequency for an eighth preset time. This speed loading method can realistically simulate the actual changes in vehicle speed during deceleration and coasting. The acceleration phase increases from a standstill to the target speed to simulate vehicle startup acceleration; the uniform speed phase maintains the target speed to simulate stable vehicle driving; and the deceleration phase first reduces the speed to the first target value and then fluctuates at a preset amplitude and frequency for a period of time, simulating the speed fluctuations that may occur during deceleration, more closely resembling actual driving conditions.

[0019] The present invention has the following beneficial effects: (1) The detection system of the present invention can detect in advance whether the drive shaft has such quality risks of abnormal noise during deceleration and coasting during the test bench stage. By simulating the deceleration and coasting conditions of the entire vehicle, the system can accurately reproduce the stress conditions and movement state of the drive shaft under the deceleration and coasting conditions of the entire vehicle, and conduct detailed monitoring of key parts such as the fixed joint ball cage. Once the abnormal noise characteristics are detected, it can be determined in time that the drive shaft has quality problems, preventing the problem products from entering the subsequent production links or the market, thus ensuring product quality from the source and effectively avoiding the safety risks and economic losses that may be caused by drive shaft failures.

[0020] (2) The detection system of the present invention can complete the detection of the drive shaft during the test bench stage, eliminating the need for lengthy road tests. By accurately simulating the energy recovery conditions of a new energy vehicle during deceleration and coasting, the system can quickly obtain the performance data of the drive shaft and quickly determine whether there is an abnormal noise problem. This not only greatly shortens the road test verification cycle, but also significantly reduces the manpower, material, and time costs of the detection process, thereby improving the company's production efficiency and market response speed.

[0021] (3) The detection system of the present invention uses objective detection data and standardized evaluation methods. It uses devices such as torque sensors, speed sensors, and sound sensors to collect real-time torque, speed, and abnormal noise data of the drive shaft under simulated working conditions, and transmits this data to the control terminal for analysis and processing. The control terminal objectively evaluates the performance of the drive shaft based on preset standards and algorithms, reducing reliance on the subjective judgment of professionals, making the detection results more scientific, accurate, and repeatable, and improving the reliability and consistency of drive shaft quality detection.

[0022] (4) The detection system of the present invention is designed and optimized specifically for the special operating conditions of new energy vehicles. By simulating the deceleration and coasting conditions of the entire vehicle through the control terminal, and combining the slide, pendulum, angle ruler and other equipment, the position and angle of the drive shaft under test can be accurately adjusted to be consistent with the angle arranged on the entire vehicle. At the same time, the load box can apply a suitable load to the drive shaft under test, thereby realistically reproducing the force and motion state of the drive shaft during the energy recovery during deceleration and coasting of the new energy vehicle. This innovative design fills the gap in the industry in the detection of abnormal noise of drive shafts under this operating condition and provides an effective solution for the quality inspection of drive shafts of new energy vehicles.

[0023] (5) The test device of the present invention has a simple and reasonable structure, and the connections and layout between the various components are compact, making it easy to install and debug. The drive device, torque sensor, speed sensor, first chuck, sound sensor, angle ruler, slide and swing table, second chuck and load box and other components work together to form a complete detection system. The operator only needs to install the drive shaft to be tested on the detection system according to the operating instructions, set the relevant parameters through the control terminal, and start the detection program. The entire detection process has a high degree of automation, is convenient and fast to operate, and can quickly complete the detection task of the drive shaft, greatly improving the detection efficiency and reducing the technical threshold and labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the drive shaft deceleration and coasting abnormal noise detection system according to an embodiment of the present application; Figure 2 This is a principle block diagram of the drive shaft deceleration and coasting abnormal noise detection system described in an embodiment of the present application; Figure 3 is a flow chart of the method for detecting abnormal noise during deceleration and coasting of a drive shaft according to an embodiment of the present application; Figure 4 is a curve diagram of torque loading in an embodiment of the present application; Figure 5 is a graph of speed loading in an embodiment of the present application; In the figure: 1. Drive device, 2. Torque sensor, 3. Speed ​​sensor, 4. First chuck, 5. Moving section, 6. Fixed section, 7. Sound sensor, 8. Angle ruler, 9. Slide and swing table, 10. Second chuck, 11. Load box, 12. Intermediate shaft, 13. Control terminal. DETAILED DESCRIPTION

[0025] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will be able to understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for the purpose of illustrating the present invention and are not intended to limit the scope of protection of the present invention.

[0026] In the embodiments of the present application, in order to clearly describe the technical solutions of the embodiments of the present application, words such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. Those skilled in the art will understand that words such as "first" and "second" do not limit the quantity or execution order, and words such as "first" and "second" do not necessarily mean different. There is no order of precedence or priority between the technical features described by "first" and "second".

[0027] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner to facilitate understanding.

[0028] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, a drive shaft deceleration sliding abnormal noise detection system includes a drive device 1, a torque sensor 2, a speed sensor 3, a first chuck 4, a sound sensor 7, an angle ruler 8, a slide and a swing table 9, a second chuck 10, a load box 11 and a control terminal 13. The connection relationship between the above components is as follows: The drive unit 1 is in driving connection with the first chuck 4, transmitting the power output from the drive unit 1 to the first chuck 4. A torque sensor 2 and a speed sensor 3 are installed in the power transmission path between the first chuck 4 and the drive unit 1. They are respectively connected to a control terminal 13, monitoring the torque and speed output by the drive unit 1 to the first chuck 4 in real time and transmitting the monitored data to the control terminal 13. The drive shaft under test consists of a movable section 5, a fixed section 6, and an intermediate shaft 12. During testing, the movable section 5 of the drive shaft under test is fixedly connected to the first chuck 4, while the fixed section 6 of the drive shaft under test is fixedly connected to the second chuck 10. A sliding table and a swing table 9 are connected to the second chuck 10, pulling the second chuck 10 along the axial direction of the drive shaft under test (sliding to a preset position based on the center distance of the drive shaft). An angle ruler 8 is connected to the second chuck 10 to adjust the drive shaft under test to its intended placement angle on the vehicle (typically 0° to 6°). During adjustment, the angle of rotation of the second chuck is set using angle ruler 8 (for example, 3°). After manually rotating the second chuck 10 to 3°, angle ruler 8 can maintain the second chuck 10 in the 3° position. A load box 11 is connected to the second chuck 10 and is used to apply a load to the drive shaft under test, simulating the load of the entire vehicle on the wheel hub bearing. A control terminal 13 is connected to the drive device 1 to simulate the deceleration and coasting conditions of the entire vehicle. A sound sensor 7 is connected to the control terminal 13 to collect abnormal sound data in real time and transmit it to the control terminal 13.

[0029] The drive shaft under test is mounted on the drive shaft deceleration coasting noise detection system in the vehicle's posture. Drive device 1 simulates the vehicle's acceleration, constant speed, and deceleration cycle, applying torque and speed. During the deceleration phase, the vehicle's energy recovery system is simulated, with positive rotation and negative torque, and the speed fluctuates continuously. This cycle is repeated multiple times (typically 6-10). During the test, the sound sensor 7 transmits the test data in real time to the control terminal 13. If periodic abnormal noise is detected during the deceleration phase, the drive shaft under test is deemed to have a quality defect.

[0030] like Figure 1 As shown, in one possible embodiment, the torque sensor 2 and the speed sensor 3 are both mounted on the first chuck 4. Centrally mounting the torque sensor 2 and the speed sensor 3 on the first chuck 4 reduces measurement errors that may be caused by dispersed sensor installation locations in the power transmission path. This allows for more accurate acquisition of the torque and speed data output by the drive device 1 to the first chuck 4, providing a reliable basis for subsequent accurate simulation of vehicle deceleration and coasting conditions and analysis of the drive shaft status.

[0031] like Figure 1 As shown, in a possible embodiment, the load box 11 includes a hydraulic system and a friction block. The hydraulic system is connected to the friction block. The hydraulic system applies a load to the drive shaft under test by controlling the clamping force between the friction block and the second chuck 10. The hydraulic system is used to control the clamping force between the friction block and the second chuck 10 to apply the load. This method can conveniently and flexibly adjust the load size. By changing the pressure of the hydraulic system, the degree of clamping of the friction block on the second chuck 10 can be accurately controlled, thereby achieving the application of different loads to the drive shaft under test to meet the needs of different testing conditions. It can also more realistically simulate the load conditions borne by the drive shaft of the entire vehicle during actual driving.

[0032] like Figure 1 As shown, in one possible embodiment, the sound sensor 7 is a decibel meter, fixed above the fixed joint 6. A decibel meter is a device specifically designed to measure sound intensity. Using it as the sound sensor 7 accurately collects data such as the decibel level of abnormal noise generated during the drive shaft's deceleration and coasting. Fixing it in this specific position above the fixed joint 6 allows for closer proximity to the source of the abnormal noise, reducing interference from external ambient noise and improving the accuracy of abnormal noise data collection.

[0033] like Figure 1 As shown, in one possible embodiment, the drive device 1 is transmission-connected to the first chuck 4 via a spline. The spline connection has high transmission accuracy and reliability, ensuring that the power output by the drive device 1 is stably and accurately transmitted to the first chuck 4, reducing energy loss and vibration during power transmission, and ensuring that the entire detection system can operate stably according to the set working conditions.

[0034] like Figure 1 As shown, in one possible embodiment, the movable joint 5 and the first chuck 4 are fixedly connected via a spline. This spline connection provides strong connection strength, ensuring that the movable joint 5 and the first chuck 4 do not slip or loosen relative to each other during testing, thus ensuring the continuity and stability of power transmission. Furthermore, the spline connection offers high concentricity, ensuring the coaxiality of the movable joint 5 and the first chuck 4, reducing additional vibration and error caused by inaccurate connection, and improving the accuracy of test results.

[0035] like Figure 1 As shown, in one possible embodiment, the fixed section 6 is fixedly connected to the second chuck 10 via a spline. The spline fixed connection can stably fix the fixed section 6 to the second chuck 10, so that the drive shaft maintains the correct position and posture during the testing process, ensuring that the slide and swing table 9 and the angle ruler 8 can accurately pull the second chuck 10 for axial sliding and circumferential rotation, thereby adjusting the tested drive shaft to the correct testing position and angle.

[0036] like Figure 3 As shown, in an embodiment of the present application, a method for detecting abnormal noise during deceleration and coasting of a drive shaft adopts a system for detecting abnormal noise during deceleration and coasting of a drive shaft as in an embodiment of the present application, and the method includes the following steps: The movable section 5 of the drive shaft to be tested is connected to the first chuck 4 , and the fixed section 6 of the drive shaft to be tested is connected to the second chuck 10 , and the drive shaft to be tested is adjusted to its state on the vehicle.

[0037] The control terminal 13 sets the torque loading and speed loading of the driving device 1 to simulate the deceleration and coasting condition of the entire vehicle.

[0038] The total time of torque loading and speed loading is one cycle, and the preset number of cycles is run.

[0039] Data collection and display: the sound sensor 7 collects noise data in real time and transmits it to the control terminal 13.

[0040] The control terminal 13 determines whether the drive shaft has a quality risk of abnormal noise during deceleration sliding based on the collected data.

[0041] In a possible embodiment, the torque loading is specifically: During the acceleration phase, positive torque is applied for a first preset time. During the constant speed phase, the torque is reduced to zero for a second preset time. During the deceleration phase, the torque is reduced to a negative torque for a third preset time and a fourth preset time. This torque loading method accurately simulates the actual torque changes during vehicle deceleration and coasting. Positive torque is applied during the acceleration phase to simulate vehicle acceleration, while the torque is reduced to zero during the constant speed phase to simulate constant speed driving. During the deceleration phase, the torque is reduced to a negative torque to simulate braking and deceleration.

[0042] For example, the driving device 1 adopts a servo motor, and the control terminal 13 presses Figure 4 The torque loading curve shown sets the loading torque of the servo motor as follows: 200 N.m acceleration for 3 seconds, 0 N.m constant speed for 0.3 seconds, deceleration from 0 N.m to -300 N.m within 0.3 seconds, and then deceleration at -300 N.m for 6.1 seconds, with a total of 9.7 seconds as one cycle.

[0043] In one possible embodiment, speed loading is specifically as follows: the acceleration phase increases the speed from a standstill to the target speed for a fifth preset time, the uniform speed phase maintains the target speed for a sixth preset time, and the deceleration phase reduces the speed to a first target value within a seventh preset time, then fluctuates at a preset amplitude and frequency for an eighth preset time. This speed loading method can realistically simulate the actual changes in vehicle speed during deceleration and coasting. The acceleration phase increases the speed from a standstill to the target speed to simulate vehicle startup acceleration, the uniform speed phase maintains the target speed to simulate stable vehicle driving, and the deceleration phase first reduces the speed to a first target value and then fluctuates at a preset amplitude and frequency for a period of time, simulating the speed fluctuations that may occur during deceleration, more closely resembling actual driving conditions.

[0044] For example, the control terminal 13 presses Figure 5 The speed loading curve shown sets the loading speed of the servo motor as follows: acceleration from standstill to 300 rpm within 3 seconds, constant speed operation for 0.3 seconds, deceleration from 300 rpm to 200 rpm within 1 second, and repeated fluctuations of +30 rpm and then -60 rpm at a speed change of 10 rpm every 0.1 seconds for 5.4 seconds, with a total of 9.7 seconds as one cycle.

[0045] For example, the device is started, and a total of 9.7 seconds is used as a cycle for acceleration-constant speed-deceleration, and the device is stopped after running 8 cycles.

[0046] For example, a decibel meter is installed 20 mm above the fixed joint 6, converting acoustic signals into electrical signals and displaying them as a curve on the display screen of the control terminal 13. When the grease performance of the fixed joint 6 deteriorates significantly after endurance testing, the steel balls inside the cage reciprocate under the negative torque and speed fluctuations during the deceleration phase, and the inner and outer raceways rub against each other, producing abnormal noise. At this time, the decibel value collected and displayed by the decibel meter is abnormally high.

[0047] For example, when an obvious abnormal peak is found in the noise decibel curve corresponding to the deceleration time period, and it is periodic, it can be determined that the tested drive shaft has a quality risk of abnormal noise during deceleration and sliding.

[0048] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A drive shaft deceleration and sliding abnormal noise detection system, characterized in that: It includes a driving device (1), a torque sensor (2), a speed sensor (3), a first chuck (4), a sound sensor (7), an angle ruler (8), a slide and a swing table (9), a second chuck (10), a load box (11) and a control terminal (13); The driving device (1) is in transmission connection with the first chuck (4), transmitting the power output by the driving device (1) to the first chuck (4); the first chuck (4) is also used to connect with the moving section (5) of the drive shaft to be tested; The torque sensor (2) and the speed sensor (3) are installed on the power transmission path between the first chuck (4) and the driving device (1), and the torque sensor (2) and the speed sensor (3) are respectively connected to the control terminal (13) for real-time monitoring of the torque and speed output by the driving device (1) to the first chuck (4), and transmitting the monitoring data to the control terminal (13); The second chuck (10) is used to be connected to the fixed joint (6) of the drive shaft to be measured, the slide and the swing table (9) are connected to the second chuck (10) and are used to pull the second chuck (10) to slide along the axial direction of the drive shaft to be measured, and the angle ruler (8) is connected to the second chuck (10) and is used to adjust the drive shaft to be measured to its arrangement angle on the whole vehicle; The load box (11) is connected to the second chuck (10) and is used to apply a load to the drive shaft under test; The control terminal (13) is connected to the driving device (1) and is used to simulate the deceleration and coasting condition of the entire vehicle; The sound sensor (7) is connected to the control terminal (13) and is used to collect abnormal sound data in real time and transmit it to the control terminal (13).

2. The drive shaft deceleration coasting abnormal noise detection system according to claim 1, characterized in that: The torque sensor (2) and the speed sensor (3) are both mounted on the first chuck (4).

3. The drive shaft deceleration coasting abnormal noise detection system according to claim 1, characterized in that: The load box (11) comprises a hydraulic system and a friction block, wherein the hydraulic system is connected to the friction block, and the hydraulic system applies a load to the measured drive shaft by controlling the clamping force between the friction block and the second chuck (10).

4. The drive shaft deceleration coasting abnormal noise detection system according to claim 1, characterized in that: The sound sensor (7) adopts a decibel meter, and the decibel meter is fixed above the fixed section (6).

5. The drive shaft deceleration coasting abnormal noise detection system according to claim 1, characterized in that: The driving device (1) is transmission-connected to the first chuck (4) via a spline.

6. The drive shaft deceleration coasting abnormal noise detection system according to claim 1, characterized in that: The movable joint (5) is fixedly connected to the first chuck (4) via a spline.

7. The drive shaft deceleration coasting abnormal noise detection system according to claim 1, characterized in that: The fixed section (6) is fixedly connected to the second chuck (10) via a spline.

8. A method for detecting abnormal noise during deceleration of a drive shaft, characterized in that: The drive shaft deceleration coasting abnormal noise detection system according to any one of claims 1 to 7 is used, and the method includes the following steps: Connecting the movable section (5) of the drive shaft to be tested to the first chuck (4), connecting the fixed section (6) of the drive shaft to be tested to the second chuck (10), and adjusting the drive shaft to be tested to its state on the vehicle; The torque loading and speed loading of the driving device (1) are set by the control terminal (13) to simulate the deceleration and coasting condition of the entire vehicle; The total time of torque loading and speed loading is one cycle, and the preset number of cycles is run; The noise data is collected in real time by the sound sensor (7) and transmitted to the control terminal (13); The control terminal (13) determines whether the tested drive shaft has a deceleration and sliding noise quality risk based on the collected data.

9. The method for detecting abnormal noise during deceleration of a drive shaft according to claim 8, characterized in that: The torque loading is specifically: The acceleration section applies positive torque and runs for a first preset time, the uniform speed section reduces the torque to zero and runs for a second preset time, and the deceleration section reduces the torque to negative torque within a third preset time and lasts for a fourth preset time.

10. The method for detecting abnormal noise during deceleration of a drive shaft according to claim 8, characterized in that: The speed loading is specifically as follows: the acceleration section increases from standstill to the target speed and runs for the fifth preset time, the uniform speed section maintains the target speed for the sixth preset time, and the deceleration section reduces the speed to the first target value within the seventh preset time and then continues for the eighth preset time at the preset fluctuation amplitude and frequency.

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