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Whole vehicle short-mileage NVH verification method

A verification method and mileage technology, applied in the automotive field, can solve problems such as failure to complete, program change, cycle and cost increase, etc.

Active Publication Date: 2021-07-30
CHINA FIRST AUTOMOBILE
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  • Abstract
  • Description
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Problems solved by technology

[0002]With the continuous improvement of the user's requirements for the driving quality of the car, the brake noise, especially the brake noise in the cold state, has attracted more and more attention. The dynamic NVH long-mileage (16000km) verification needs at least 2 months, limited by the development progress and the low temperature window period, a complete round of NVH noise tests cannot be completed in the early stage of development. Complaints, the cycle and cost of program changes will increase exponentially
[0003] The existing process of brake pad NVH development is friction material selection-bench noise optimization-real vehicle noise verification, and the low-temperature noise verification should be completed first according to the order of seasons Then complete the normal temperature noise verification, but the low temperature noise is limited by the weather window period. If the low temperature noise verification cannot be completed first during the development process, there will be a great risk of program change in the future

Method used

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Embodiment

[0036] In a certain project development process, the vehicle short mileage NVH verification method of the present invention is adopted, and the specific data are as follows under each working condition:

[0037] Total braking times: 9871

[0038]

[0039] In summary, 1500hz and 2400hz low-temperature noises have been successfully verified, and the noise occurrence probability exceeds 3‰. Therefore, it is necessary to optimize the noises and provide a data basis for subsequent optimization schemes.

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Abstract

The invention relates to the technical field of automobiles, in particular to a whole vehicle short-mileage NVH verification method. The method comprises the following steps: 1, carrying out initial measurement on dragging torque and thickness change of a brake disc; 2, carrying out running-in on the vehicle; 3, performing a road test on an open road surface; 4, evaluating the performance of the vehicle; and 5, if the review passes, outputting a result, and if the review does not pass, re-executing the steps until the review passes. The method is used for rapidly evaluating the low-temperature noise of the friction material in the early stage, the influence of a window period on project development is avoided to the maximum extent, and the follow-up possible scheme change risk can be reduced.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a short-mileage NVH verification method for a complete vehicle. Background technique [0002] With the continuous improvement of the user's requirements for the driving quality of the car, brake noise, especially the brake noise in the cold state, has attracted more and more attention. However, a complete one-wheel brake NVH long-mileage (16000km) verification needs at least 2 months, subject to Due to the limited development progress and low temperature window period, a complete round of NVH noise tests cannot be completed in the early stage of development. After the plan is confirmed, once there are complaints about cold noise in subsequent tests, the cycle and cost of plan changes will increase exponentially. [0003] The current process of brake pad NVH development is friction material selection-bench noise optimization-real vehicle noise verification. According to the or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/007
CPCG01M17/007Y02T90/00
Inventor 何晰浩陶庆华隋清海皮胜楠
Owner CHINA FIRST AUTOMOBILE
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