An air-tightness automatic measurement system when vehicle is running

CHENG Zhi-wei1, XV Wen2

(1.Guangzhou Automotive Group Co., Ltd., Guangzhou 511434, China;

2.Dongfeng EME Co., Ltd., Wuhan 430056, China)

Abstract: Aiming at some still serious leak problem about weatherstrip of door and window when vehicle is running at high speed on actual road, a viewpoint was proposed that dynamic air leakage performance will be more important target to be controlled than static air leakage performance. So air-tightness test device was designed and manufactured,which was contained automatic processing system based on data acquisition during running, also including sensors, measuring points, software application and data acquisition; overpressure value of the passenger compartment related to the outer environment, air flow rate across the vehicle boundary temperature parameter etc, whose function was provided with generating figure and calculation of equivalent leakage cross sectional area about full vehicle body with software package by use of LabVIEW and Matlab comprehensively. The results indicate that the simple and effective method of dynamic air-tightness can be applied as a measurement tool with both theory and practice when vehicle is running.

Key words: equivalent leakage cross sectional area; dynamic air-tightness test device; automatic data acquisition system.