Hybrid power DHT assembly rack NVH test method and system
By conducting collaborative testing and data analysis on a hybrid powertrain DHT powertrain bench under multiple operating conditions and at multiple measurement points, the problems of single testing mode and limited measurement point layout in existing technologies have been solved. This has enabled full operating condition coverage and refined measurement point arrangement for the hybrid powertrain DHT powertrain, thereby improving the accuracy of NVH testing.
Patent Information
- Application Number
- CN202510769621.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-10
- Publication Date
- 2025-11-07
AI Technical Summary
Existing hybrid powertrain DHT bench NVH testing technology suffers from problems such as single test mode, incomplete operating condition coverage, and limited test point layout. In particular, it lacks a systematic approach to combining dynamic and steady-state operating conditions, fails to fully cover all operating modes of the hybrid system, and ignores key vibration transmission paths.
The hybrid powertrain DHT powertrain bench NVH test method was adopted. Multiple vibration and noise measurement points were arranged on a three-motor bench in a semi-anechoic chamber. Tests were conducted under various operating conditions, and data processing and analysis were performed, including coordinated testing of dynamic and steady-state operating conditions. The layout of measurement points was optimized to cover the vibration transmission path of key components.
It achieves full-condition coverage of the hybrid DHT powertrain, with refined measurement point layout, identification of the vibration and noise characteristics of each component, assisting in subsequent optimization, and more accurately locating the source of noise.
Smart Images
Figure CN120907849A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of NVH testing, and more particularly to a hybrid DHT assembly bench NVH testing method and system. BACKGROUND
[0002] Noise, Vibration, Harshness (NVH) testing, referred to as NVH testing, is a comprehensive problem for measuring the quality of automobile manufacturing, which is most directly felt by automobile users. The NVH problem of the automobile body is one of the problems that international automobile manufacturers and component manufacturers focus on. The current hybrid DHT assembly bench NVH testing technology has the following deficiencies: 1. Single test mode: the existing method focuses on single dynamic or steady state test, and lacks systematic combination of dynamic and steady state conditions. 2. Incomplete working condition coverage: dynamic testing does not completely cover the four types of working modes of the hybrid system, i.e. power generation, pure electricity, series connection and parallel connection, and the steady state condition sampling points are selected coarsely (such as only selecting the rated value). 3. Limited layout of measuring points: the traditional scheme ignores the key vibration transmission paths such as the reducer shaft system (such as the one-axis / two-axis bearing seat) and the motor shaft end. Therefore, for those skilled in the art, how to overcome the above-mentioned defects is a problem to be solved. SUMMARY
[0003] Therefore, the present application provides a hybrid DHT assembly bench NVH testing method and system to solve the problems raised in the background art and realize the cooperative testing of dynamic and steady state conditions and cover the full working mode of the hybrid system.
[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: on the one hand, a hybrid DHT assembly bench NVH testing method is provided, and the specific steps include the following: S1, installing the hybrid DHT assembly on a semi-anechoic chamber three-motor bench, and arranging a plurality of vibration measuring points and a plurality of noise measuring points; S2, dividing the test conditions into: steady state power generation condition, steady state pure electricity condition, steady state parallel connection condition, dynamic power generation condition, dynamic pure electricity condition acceleration mode, dynamic pure electricity condition coasting mode, dynamic series connection condition acceleration mode, dynamic series connection condition coasting mode, dynamic parallel connection condition acceleration mode, and dynamic parallel connection condition coasting mode; S3, testing in each condition in S2, and collecting data at the vibration measuring points and the noise measuring points to obtain noise signal data and accelerator signal data.
[0005] Preferably, the noise signal data and the accelerator signal data are further subjected to data processing, and the specific steps are as follows: The noise signal data is subjected to average value processing to obtain POWAG noise signal data; The noise signal data, the POWAG noise signal data and the accelerator signal data are subjected to FFT analysis to obtain noise and POWAG noise signals and vibration Colormap spectra of all measuring points respectively; According to the order to be analyzed, the generator speed and the driving motor speed are tracked to obtain a speed-order near-field noise curve, a speed-POWAG order noise curve and a speed-order vibration curve. According to the test noise signal and the POWAG noise signal, the generator speed and the driving motor speed are tracked to obtain a speed-near-field total sound pressure level noise curve and a speed-POWAG total sound pressure noise curve.
[0006] Preferably, the steady state working condition is sampled at a gradient of 500 r / min and 10 N.m.
[0007] By adopting the above technical scheme, the following beneficial technical effects are achieved: in the steady state power generation, pure electricity and parallel working conditions, a speed point (including the rated speed and the highest speed) is selected every 500 r / min, and a torque point (including the rated torque and the peak torque) is selected every 10 Nm, so that data refinement is achieved.
[0008] Preferably, the arrangement mode of the vibration measuring points is that acceleration sensors are arranged at main features of the hybrid power DHT assembly, and the main features include a driving motor shell, a generator shell, an electronic control shell, a reducer one shaft bearing seat, a reducer two shaft bearing seat, a driving motor shaft bearing seat, a generator shaft bearing seat, an electronic oil pump, an electronic control support seat and a suspension hole.
[0009] Preferably, the arrangement of the noise measuring points is that five microphones are arranged on the front, back, left and right of the center line of the hybrid power DHT assembly, and the distance from the outer envelope surface of the hybrid power DHT assembly is 1 meter; one microphone is arranged on the generator axis, and the distance from the outer envelope surface of the generator shell is 0.1 meter; one microphone is arranged on the driving motor axis, and the distance from the outer envelope surface of the driving motor shell is 1 meter; one microphone is arranged on the reducer two shaft axis, and the distance from the outer envelope surface of the reducer shell is 0.1 meter; one microphone is arranged on the end surface of the electronic control shell, and the distance from the outer envelope surface of the electronic control shell is 0.1 meter; and one microphone is arranged on the electronic oil pump shell, and the distance from the outer envelope surface of the electronic oil pump shell is 0.1 meter.
[0010] By adopting the above technical scheme, the following beneficial technical effects are achieved: through shaft system near-field acoustic analysis (such as the 0.1 meter microphone of the reducer two shaft), the noise source is locked, the transmission path is analyzed through vibration sensor analysis, and support is provided for subsequent optimization, and the positioning is more accurate.
[0011] Preferably, the vibration signal collection frequency is 25600Hz, the noise signal is greater than or equal to 51200Hz, and the frequency resolution is 2Hz; the speed tracking step is 25r / min, and the order bandwidth is set to +0.25 order.
[0012] In another aspect, a hybrid DHT assembly bench NVH test system is provided, comprising a measurement point arrangement module, a working condition division module, and a test module; wherein The measurement point arrangement module is configured to mount the hybrid DHT assembly on a semi-anechoic room three-motor bench, and arrange a plurality of vibration measurement points and a plurality of noise measurement points. The working condition division module is configured to divide the test working conditions into: a steady-state power generation condition, a steady-state pure electric condition, a steady-state parallel condition, a dynamic power generation condition, a dynamic pure electric condition acceleration mode, a dynamic pure electric condition coasting mode, a dynamic series condition acceleration mode, a dynamic series condition coasting mode, a dynamic parallel condition acceleration mode, and a dynamic parallel condition coasting mode. The test module is configured to perform testing under each working condition, collect data at the vibration measurement points and the noise measurement points, and obtain noise signal data and accelerator signal data.
[0013] According to the above technical solution, compared with the prior art, the present application has the following beneficial technical effects: 1. The dynamic four-mode (power generation / pure electric / series / parallel) is combined with the steady-state three-path (power generation / pure electric / parallel) test, and the working characteristics of the hybrid system are fully covered through the dynamic / steady-state cooperative test method. 2. Measurement point layout optimization: new reducer shaft system (one shaft / two shaft bearing seat) and motor shaft end measurement points are added, covering the gear meshing and bearing vibration transmission path, and the vibration and noise characteristics of each component of the assembly are identified through fine measurement point arrangement. BRIEF DESCRIPTION OF DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.
[0015] Figure 1 The method flowchart of the present application; Figure 2 The vibration measurement point arrangement diagram of the present application. DETAILED DESCRIPTION
[0016] With reference to the accompanying drawings: clearly and completely describe the technical solutions in the embodiments of the present application, obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.
[0017] The embodiment of the present application provides a hybrid DHT assembly bench NVH test method, as shown in the figure, the specific steps include the following: Figure 1 S1, install the hybrid DHT assembly on the semi-anechoic room three-motor bench, arrange a plurality of vibration measuring points and a plurality of noise measuring points; S2, divide the test conditions into: steady-state power generation condition, steady-state pure electric condition, steady-state parallel condition, dynamic power generation condition, dynamic pure electric condition acceleration mode, dynamic pure electric condition coasting mode, dynamic series condition acceleration mode, dynamic series condition coasting mode, dynamic parallel condition acceleration mode, dynamic parallel condition coasting mode; S3, test in each condition in S2, collect data at the vibration measuring points and the noise measuring points, obtain noise signal data and accelerator signal data.
[0018] Further, the noise signal data and the accelerator signal data are further subjected to data processing, and the specific steps are: average value processing is performed on the noise signal data to obtain POWAG noise signal data; perform FFT analysis on the noise signal data, the POWAG noise signal data and the accelerator signal data to respectively obtain noise and POWAG noise signals of all measuring points, vibration Colormap spectrum; According to the order to be analyzed, the generator speed and the driving motor speed are tracked to obtain a speed-order near-field noise curve, a speed-POWAG order noise curve and a speed-order vibration curve; According to the test noise signal and the POWAG noise signal, the generator speed and the driving motor speed are tracked to obtain a speed-near-field total sound pressure level noise curve and a speed-POWAG total sound pressure noise curve.
[0019] Further, the arrangement mode of the vibration measuring points in step S1 is to arrange acceleration sensors at the main features of the hybrid DHT assembly, as shown in the figure, Figure 2 The three-direction acceleration sensors are arranged on the driving motor shell (1), the generator motor shell (1), the electronic control shell (1), the reducer one shaft bearing seat (1), the reducer two shaft bearing seat (1), the driving motor shaft bearing seat (1), the generator shaft bearing seat (1), the electronic oil pump shell (1), the electronic control support (4), and the suspension mounting hole (2), and a total of 15 three-direction acceleration sensors are arranged.
[0020] The noise measuring points are arranged as follows: five microphones are arranged on the front, back, left and right of the center line of the hybrid DHT assembly, 1 meter away from the outer envelope surface of the hybrid DHT assembly; one microphone is arranged on the generator shaft line, 0.1 meters away from the outer envelope surface of the generator shell; one microphone is arranged on the driving motor shaft line, 1 meter away from the outer envelope surface of the driving motor shell; one microphone is arranged on the reducer two shaft line, 0.1 meters away from the outer envelope surface of the reducer shell; one microphone is arranged on the end surface of the electronic control shell, 0.1 meters away from the outer envelope surface of the electronic control shell, and one microphone is arranged on the electronic oil pump shell, 0.1 meters away from the outer envelope surface of the electronic oil pump shell.
[0021] The data acquisition is set as follows: the vibration signal acquisition frequency is 25600Hz, the noise signal is greater than or equal to 51200Hz, and the frequency resolution is 2Hz; the speed tracking step is 25r / min, the order bandwidth is ±0.25 order, and the concerned order is set; the steady state working condition is sampled at a gradient of 500r / min and 10N.m.
[0022] Further, the test starts under the steady state working condition: The steady state power generation working condition test starts from 500r / min, with a step of 500r / min, until the highest speed of the generator; The steady state power generation working condition test starts from 10N.m, with a step of 10N.m, until the peak torque of the generator; The steady state pure electric working condition test starts from 500r / min, with a step of 500r / min, until the highest speed of the driving motor; The steady state pure electric working condition test starts from 10N.m, with a step of 10N.m, until the peak torque of the driving motor; The steady state parallel working condition test starts from 1000r / min, with a step of 500r / min, until the highest input speed of the hybrid DHT assembly; The steady state parallel working condition test starts from 10N.m, with a step of 10N.m, until the peak input torque of the hybrid DHT assembly; Further, the dynamic working condition test starts: Dynamic power generation operating condition test: the generator speed starts from 1000 r / min, and rises to the peak speed of the generator at a speed slope of 200 r / min / s, and the torque is loaded with different percentages of the generator external characteristic torque, such as 25%, 50%, 75%, and 100% external characteristic.
[0023] Dynamic pure electric operating condition test, acceleration condition: the driving motor speed starts from 500 r / min, and rises to the peak speed of the generator at a speed slope of 200 r / min / s, and the torque is loaded with different percentages of the generator external characteristic torque, such as 25%, 50%, 75%, and 100% external characteristic.
[0024] Dynamic pure electric operating condition test, coasting condition: the driving motor speed decreases from the highest speed to 500 r / min at a rate of 200 rpm / s, and the torque is loaded in turn at -30 Nm, -50 Nm, and -70 Nm.
[0025] Dynamic series operating condition, acceleration condition: simulate the demand of different throttle requirements of vehicle acceleration, such as 25%, 50%, 75%, and 100% throttle opening, and the bench runs the speed and torque curves corresponding to different throttle; Dynamic series operating condition, coasting condition: simulate the demand of different brake energy recovery modes when the vehicle is coasting, and the bench runs the speed and torque curves corresponding to different brake energy recovery modes; Dynamic parallel operating condition, acceleration condition: simulate the demand of different throttle requirements of vehicle acceleration, such as 25%, 50%, 75%, and 100% throttle opening, and the bench runs the speed and torque curves corresponding to different throttle; Dynamic parallel operating condition, coasting condition: simulate the demand of different brake energy recovery modes when the vehicle is coasting, and the bench runs the speed and torque curves corresponding to different brake energy recovery modes.
[0026] In another aspect, a hybrid DHT assembly bench NVH test system is provided, comprising a test point arrangement module, a working condition division module, and a test module; wherein The test point arrangement module is used to install the hybrid DHT assembly on a semi-anechoic room three-motor bench, and arrange a plurality of vibration test points and a plurality of noise test points; The working condition division module is used to divide the test working conditions into: steady-state power generation condition, steady-state pure electric condition, steady-state parallel condition, dynamic power generation condition, dynamic pure electric acceleration mode, dynamic pure electric coasting mode, dynamic series acceleration mode, dynamic series coasting mode, dynamic parallel acceleration mode, and dynamic parallel coasting mode; The test module is used to test under each working condition, collect data at the vibration test points and the noise test points, and obtain noise signal data and accelerator signal data.
[0027] The various embodiments described in this specification are implemented in a progressive manner, each embodiment focusing on the differences from other embodiments, and the same or similar parts between embodiments can be mutually referred to. For the apparatus disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.
[0028] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A hybrid DHT assembly bench NVH test method, characterized in that, The specific steps include the following: S1, install the hybrid DHT assembly on a semi-anechoic chamber three-motor test bench, arrange a plurality of vibration measuring points and a plurality of noise measuring points; S2, divide the test conditions into: steady-state power generation condition, steady-state pure electric condition, steady-state parallel condition, dynamic power generation condition, dynamic pure electric condition acceleration mode, dynamic pure electric condition coasting mode, dynamic series condition acceleration mode, dynamic series condition coasting mode, dynamic parallel condition acceleration mode, and dynamic parallel condition coasting mode; S3, test in each condition in S2, collect data at the vibration measuring points and the noise measuring points, and obtain noise signal data and accelerator signal data.
2. The hybrid DHT assembly bench NVH test method of claim 1, wherein, Further comprising, data processing on the noise signal data and the accelerator signal data, and the specific steps are: average value processing on the noise signal data to obtain POWAG noise signal data; FFT analysis on the noise signal data, the POWAG noise signal data and the accelerator signal data to respectively obtain noise and POWAG noise signals of all measuring points and vibration Colormap spectrum; tracking generator speed and driving motor speed according to the order to be analyzed to obtain speed-order near-field noise curve, speed-POWAG order noise curve and speed-order vibration curve; tracking generator speed and driving motor speed according to test noise signal and POWAG noise signal to obtain speed-near-field total sound pressure level noise curve and speed-POWAG total sound pressure noise curve.
3. The hybrid DHT assembly bench NVH test method of claim 1, wherein, The steady-state condition is sampled at 500 r / min and 10 N.m gradient.
4. The hybrid DHT assembly bench NVH test method of claim 1, wherein, The arrangement of the vibration measuring points is to arrange acceleration sensors at main features of the hybrid DHT assembly, and the main features include driving motor shell, generator shell, electronic control shell, reducer one shaft bearing seat, reducer two shaft bearing seat, driving motor shaft bearing seat, generator shaft bearing seat, motor oil pump, electronic control support seat and suspension hole.
5. The hybrid DHT assembly bench NVH test method of claim 1, wherein, The arrangement of the noise measuring points is to arrange five microphones on the front, back, left and right of the center line of the hybrid DHT assembly, 1 meter away from the outer envelope surface of the hybrid DHT assembly; arrange one microphone on the generator shaft line, 0.1 meter away from the outer envelope surface of the generator shell; arrange one microphone on the driving motor shaft line, 1 meter away from the outer envelope surface of the driving motor shell; arrange one microphone on the reducer two shaft line, 0.1 meter away from the outer envelope surface of the reducer shell; arrange one microphone on the end face of the electronic control shell, 0.1 meter away from the outer envelope surface of the electronic control shell, and arrange one microphone on the electronic oil pump shell, 0.1 meter away from the outer envelope surface of the electronic oil pump shell.
6. The hybrid DHT assembly bench NVH test method of claim 1, wherein, The vibration signal collection frequency is 25600 Hz, the noise signal is greater than or equal to 51200 Hz, and the frequency resolution is 2 Hz; the speed tracking step is 25 r / min, and the order bandwidth is set to be concerned order ±0.25 order.
7. A hybrid DHT assembly bench NVH test system characterized by, It includes a measuring point arrangement module, a condition division module and a test module. The measuring point arrangement module is used to install the hybrid DHT assembly on a semi-anechoic chamber three-motor test bench, and arrange a plurality of vibration measuring points and a plurality of noise measuring points. The working condition division module is configured to divide the test working condition into: a steady-state power generation working condition, a steady-state pure electric working condition, a steady-state parallel working condition, a dynamic power generation working condition, a dynamic pure electric working condition acceleration mode, a dynamic pure electric working condition coasting mode, a dynamic series working condition acceleration mode, a dynamic series working condition coasting mode, a dynamic parallel working condition acceleration mode, and a dynamic parallel working condition coasting mode. The test module is configured to perform tests in each working condition, collect data at the vibration measuring point and the noise measuring point, and obtain noise signal data and accelerator signal data.