Automobile air conditioner refrigerant flow noise analysis method and system

CN117405406BActive Publication Date: 2026-07-21CHONGQING CHANGAN AUTOMOBILE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHONGQING CHANGAN AUTOMOBILE CO LTD
Filing Date
2023-11-08
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing technologies lack objective quantitative indicators for automotive refrigerant flow noise, resulting in significant differences in subjective evaluation results. This makes it difficult to accurately reflect the severity of refrigerant flow noise in the vehicle's air conditioning system, especially since the evaluation methods for water flow noise are insufficient.

Method used

A method for analyzing refrigerant flow noise in automotive air conditioning systems is adopted. Noise signals are collected in a temperature anechoic chamber, and the noise is determined to be either airflow noise or water flow noise. The peak difference in loudness, peak difference in sharpness, and kurtosis value of expansion valve vibration are calculated. Combined with a preset noise severity assessment method, an objective assessment result is output.

Benefits of technology

It achieves objective quantification of refrigerant flow noise, avoids subjective differences in the annoyance of fan beat frequency noise among different groups, provides simulation assessments of various actual use environments, and improves the accuracy and consistency of the evaluation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to a kind of automobile air conditioner refrigerant flow noise analysis method and system, comprising the following steps: the measured vehicle is placed in the preset test environment, and the internal noise of the measured vehicle is collected;Determine whether the internal noise of the measured vehicle is airflow sound, if so, the internal noise of the measured vehicle is converted into loudness peak difference and sharpness peak difference, otherwise, determine whether the internal noise of the measured vehicle is flow water sound;If so, calculate the kurtosis value of expansion valve vibration, otherwise, the internal noise of the measured vehicle collected this time is useless data, discarded and ended;According to the loudness peak difference, sharpness peak difference and expansion valve vibration kurtosis value, combined with the preset noise severity evaluation method, the air conditioner refrigerant flow noise is evaluated, and the evaluation result is output.The application effectively quantifies the size of refrigerant flow noise objectively, and avoids the subjective evaluation difference of different groups of people on fan beat frequency noise annoyance.
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