Method for testing noise and vibration of fuel cell engine in whole vehicle state
By collecting noise and vibration data at fixed points inside the fuel tram, filtering environmental noise, and drawing the curve of the engine with power changes, the problem of large errors in the test results in the prior art is solved, and a more accurate NVH performance analysis is achieved.
Patent Information
- Application Number
- CN202411312787.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-01-03
AI Technical Summary
The existing NVH performance testing methods for fuel tram engines are difficult to accurately collect noise and vibration data in the vehicle state, and fail to effectively consider the impact of environmental noise, resulting in large errors in the test results.
The noise and vibration test method of fixed points in the car is adopted to set the engine test power operating conditions, collect noise and vibration data, and filter the environmental noise, and finally draw the noise and vibration curve of the engine with power change.
It realizes a simpler, comprehensive and accurate fuel cell engine noise and vibration test results, and can accurately analyze the impact of engine operation on NVH performance in the entire vehicle state.
Smart Images
Figure CN119246071A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of NVH testing of fuel cell vehicles, and in particular relates to a method for testing noise and vibration of a fuel cell engine in a complete vehicle state. Background Art
[0002] As fuel cell vehicle technology continues to mature, the number of fuel cell vehicles is also increasing. Compared with traditional vehicles and pure electric vehicles, fuel cell vehicle technology is more complex and has higher requirements for NVH performance test standards. When the fuel cell vehicle engine is in operation, the main sources of noise are the air compressor, cooling fan, hydrogen circulation system, water pump, etc. These devices will affect the NVH performance of the vehicle. Therefore, a test method that can collect noise and vibration data of fuel cell vehicle engines and analyze the impact of engine operation on NVH performance is extremely important.
[0003] Sun Tian; Zhang Yanyi; Chen Guang; Xiong Xingwang; Ma Jicheng. Analysis of NVH test methods for automotive fuel cell engines [J]. Automobile Practical Technology, 2023, (23): 95-98. A handheld noise tester is used to perform noise testing at the tail exhaust port. This test method is difficult to control, and the influence of environmental noise is not considered during the result processing, resulting in large errors in the test results. Summary of the invention
[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a noise and vibration test method for a fuel cell engine in a whole vehicle state. Compared with the current NVH performance test method of a fuel cell vehicle engine, the present invention performs noise and vibration tests at fixed points in the vehicle, and performs noise filtering considering the influence of background noise, and finally draws the noise and vibration curves of the engine changing with power. The test method is relatively simple, and the results are more comprehensive and accurate.
[0005] The objective of the present invention is achieved through the following technical solutions:
[0006] A method for testing noise and vibration of a fuel cell engine in a complete vehicle state comprises the following steps:
[0007] Step 1: Arrangement of the rotating hub test conditions under the complete vehicle state;
[0008] Step 2: Set the engine test power condition, perform engine noise and vibration tests, and obtain engine test data;
[0009] Step 3: Process the test data;
[0010] Step 4: Filter environmental noise;
[0011] Step 5: Combine the noise data and vibration data, and draw the noise and vibration curves respectively as they change with the fuel cell engine power.
[0012] Furthermore, in the step 1, the whole vehicle is placed on a mobile hub, and measuring points are selected and noise sensors and vibration sensors are installed respectively.
[0013] Preferably, in step one, noise sensors are installed at the left ear of the main driver, the right ear of the main driver, the left ear of the right rear seat, and the right ear of the right rear seat, respectively, to collect noise inside the car; vibration sensors are installed at the main driver's seat rail and the steering wheel to collect vibration information.
[0014] Furthermore, in the step 2, different engine test powers are set, and the fuel cell engine test power is gradually increased until the limit power is reached, and the noise, vibration and environmental noise at each power are tested.
[0015] Preferably, in step 2, the accelerator pedal is used to control the gradual increase of power, and operating points of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% of the engine power are set respectively. Noise and vibration tests are performed under each set of operating conditions to obtain test noise data and vibration data; and the environmental noise under each set of operating conditions is tested at the same time.
[0016] Preferably, in step 2, the engine noise sampling frequency is 25600 Hz, the vibration sampling frequency is 51200 Hz, and the operating time of each set of working conditions is 30 seconds.
[0017] Furthermore, in step three, the total sound pressure level of each measuring point of the in-vehicle noise is calculated, and the vibration RSS values of the steering wheel and seat rail vibrations are calculated at the same time.
[0018] Preferably, in step three, the time period during which each group of engine power can operate stably is intercepted, the total sound pressure level of noise at different power operating points of each group of engines is calculated, and the average value of vibration RSS at different power operating points of each group of engines is calculated.
[0019] Preferably, in step 4, the total noise sound pressure level at different power operating points of each group of engines is removed to obtain the hub and tire noise sound pressure level.
[0020] The present invention has the following advantages:
[0021] The present invention provides a method for testing noise and vibration of a fuel cell engine in a complete vehicle state, which performs noise and vibration tests at fixed points in the vehicle, performs noise filtering in consideration of the influence of background noise, and finally draws noise and vibration curves of the engine changing with power. The testing method is relatively simple, and the results are more comprehensive and accurate.
[0022] The present invention is not limited to in-vehicle noise and vibration. The test conditions can be carried out in road tests, and the measuring points can be located at motors, water pumps, tail exhaust pipes, air compressors, etc. The test purpose can also be used to compare the NVH performance of noise and vibration of fuel cell engines of different models. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following will describe the appended materials required for use in the embodiment.
[0024] It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as
[0025] The scope of this article is limited. For ordinary technicians in this field, without paying creative work, they can also use this
[0026] These drawings can be used to obtain other related drawings.
[0027] Figure 1 This is a flow chart of a method for testing noise and vibration of a fuel cell engine in a complete vehicle state according to the present invention;
[0028] Figure 2 The noise curve of the driver's right ear measurement point changes with the fuel cell engine power in the embodiment of the present invention;
[0029] Figure 3 This is a curve showing the vibration of the seat rail measuring point changing with the power of the fuel cell engine in an embodiment of the present invention. DETAILED DESCRIPTION
[0030] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.
[0031] The specific embodiments described are only used to explain the present invention, but not to limit the present invention.
[0032] For the purpose of description, the accompanying drawings only show parts related to the present invention rather than all structures.
[0033] In the present invention, unless otherwise clearly specified and limited, a first feature is “above” or “below” a second feature.
[0034] It may include the first and second features directly contacting each other, or it may include the first and second features not directly contacting each other but contacting each other through it.
[0035] Another characteristic contact between them.
[0036] Moreover, the first feature being “above”, “above” and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being “below”, “below” and “below” the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0037] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply the device or
[0038] The elements must have a certain orientation, be constructed and operate in a certain orientation and therefore should not be construed as limiting the present invention.
[0039] In addition, the terms “first” and “second” are merely used for distinction in description and have no special meanings.
[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0041] Example
[0042] like Figure 1 As shown, this embodiment uses the in-vehicle noise and vibration method to test a certain type of fuel cell engine with a rated power of 70kW, and the steps are as follows:
[0043] Step 1: Arrangement of the test conditions for the rotating hub in the whole vehicle state: Place the whole vehicle on the mobile rotating hub, select the measuring points and install the noise sensor and vibration sensor respectively;
[0044] Specifically, the entire vehicle is placed on a mobile rotating hub, and noise sensors are installed at the left ear of the main driver, the right ear of the main driver, the left ear of the right rear seat, and the right ear of the right rear seat to collect noise inside the vehicle; vibration sensors are installed on the main driver's seat rails and the steering wheel to collect vibration information.
[0045] Step 2: Set the engine test power condition, perform engine noise and vibration tests, and obtain engine test data: set different engine test powers, gradually increase the fuel cell engine test power until the limit power is reached, and test the noise, vibration, and environmental noise at each power;
[0046] Specifically, the accelerator pedal is used to control the gradual increase of power, and the operating points of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% of the engine power are set respectively. Noise and vibration tests are performed under each set of operating conditions to obtain test noise data and vibration data; the running time for each set of operating conditions is 30 seconds; and the environmental noise under each set of operating conditions is tested at the same time.
[0047] Among them, the engine noise sampling frequency is 25600Hz and the vibration sampling frequency is 51200Hz.
[0048] Step 3: Process the test data: calculate the total sound pressure level of each measuring point of the interior noise, and calculate the vibration RSS value of the steering wheel and seat rail vibration.
[0049] Specifically, the time period during which each group of engine power can operate stably is intercepted, the total sound pressure level of noise at different power operating points of each group of engines is calculated, and the average value of vibration RSS at different power operating points of each group of engines is calculated.
[0050] Step 4: Filter environmental noise: Remove the total noise sound pressure level calculated for each group of engine operating points at different power levels to obtain the sound pressure level of environmental noise such as the hub and tires.
[0051] Step 5: Combine the noise data and vibration data, and draw the noise and vibration curves with the fuel cell engine power, such as Figure 2 , Figure 3 shown.
[0052] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention. These simple variations all belong to the protection scope of the present invention.
[0053] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.
[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A method for testing noise and vibration of a fuel cell engine in a complete vehicle state, characterized in that: The following steps are involved: Step 1: Arrangement of the rotating hub test conditions under the complete vehicle state; Step 2: Set the engine test power condition, perform engine noise and vibration tests, and obtain engine test data; Step 3: Process the test data; Step 4: Filter environmental noise; Step 5: Combine the noise data and vibration data, and draw the noise and vibration curves respectively as they change with the fuel cell engine power.
2. A fuel cell engine noise and vibration testing method in a complete vehicle state as claimed in claim 1, characterized in that: In the step 1, the whole vehicle is placed on a mobile hub, and measuring points are selected and noise sensors and vibration sensors are installed respectively.
3. A method for testing noise and vibration of a fuel cell engine in a complete vehicle state as claimed in claim 2, characterized in that: In the step 1, noise sensors are installed at the left ear of the driver, the right ear of the driver, the left ear of the right rear seat, and the right ear of the right rear seat to collect the noise inside the car; Vibration sensors are installed on the main driver's seat rails and steering wheel to collect vibration information.
4. A fuel cell engine noise and vibration testing method in a complete vehicle state as claimed in claim 1, characterized in that: In the step 2, different engine test powers are set, and the fuel cell engine test power is gradually increased until the limit power is reached, and the noise, vibration and environmental noise at each power are tested.
5. A fuel cell engine noise and vibration testing method in a complete vehicle state as claimed in claim 4, characterized in that: In the step 2, the accelerator pedal is used to control the gradual increase of power, and the operating points of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% of the engine power are set respectively. Noise and vibration tests are performed under each set of operating conditions to obtain test noise data and vibration data; and the environmental noise under each set of operating conditions is tested at the same time.
6. A method for testing noise and vibration of a fuel cell engine in a complete vehicle state as claimed in claim 5, characterized in that: In step 2, the engine noise sampling frequency is 25600 Hz, the vibration sampling frequency is 51200 Hz, and the running time of each set of working conditions is 30 seconds.
7. A fuel cell engine noise and vibration testing method in a complete vehicle state as claimed in claim 1, characterized in that: In the step three, the total sound pressure level of each measuring point of the vehicle interior noise is calculated, and the vibration RSS values of the steering wheel and seat rail vibrations are calculated at the same time.
8. A fuel cell engine noise and vibration testing method in a complete vehicle state as claimed in claim 7, characterized in that: In the step three, the time period during which each group of engine power can operate stably is intercepted, the total sound pressure level of noise at different power operating points of each group of engines is calculated, and the average value of vibration RSS at different power operating points of each group of engines is calculated.
9. A fuel cell engine noise and vibration testing method in a complete vehicle state as claimed in claim 8, characterized in that: In the step 4, the total noise sound pressure level of each group of engines at different power operating points is removed to obtain the hub and tire noise sound pressure level.