Date collecting method for measuring automobile external noise

Abstract

A data collection method during measuring noise outside an automobile, compries: driving the automobile on a driveway between a predetermined starting part line and a measuring terminal line to perform measure; providing an automobile wireless controller local area network transceiver on the automobile and providing a ground wireless controller local area network transceiver on the ground to compose a wireless controller local area network transceiver bridge which connects a controller local area network bus in the automobile with a data collection system on the groud; the data collection system synchronizing a noise signal outside the automobile during driving the automobile and a signal reflecting a state of the automobile on the controller local area network bus of the automobile; analysing a relationship between the noise outside the automobile during driving and a travelling state of the automobile. The invention can collect and measure automobile travel data such as rotate speed of an engine, opening degree of a gas saving door, level of an automatic gearbox and the like without mounting a sensor, thereby increasing measuring efficiency.

Description

technical field [0001] The invention is a data acquisition method for measuring the noise outside the car, which is used for studying the relationship between the noise outside the car and the running state of the car. In particular, it refers to the data acquisition system that transmits data such as vehicle speed, engine speed, and vehicle throttle opening to the ground through the wireless controller area network (CAN: Controller Area NetWork, hereinafter referred to as CAN). A method of measuring the driving noise outside the car based on the microphone signal and the vehicle speed, engine speed, throttle opening, car position and other data on the driving car. Background technique [0002] According to "External Noise Limits and Measurement Methods of Accelerated Automobiles" (GB1495-2002) and "Acoustics—Measurement of Road Vehicle Acceleration Noise—Engineering Law" ISO 362, when measuring the external noise of automobiles, arrange microphones on both sides of the lane...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of adopting wireless controller local area network technology (wireless CAN network bridge) to measure the exterior of automobile in order to solve the existing problems of adopting radar velocity measurement technology and wireless LAN (local area network) technology in the measurement noise of the above-mentioned prior art. The data acquisition method in the case of noise, the vehicle operating parameters on the driving vehicle, such as vehicle speed, engine speed, throttle opening, automatic transmission gear and other data are transmitted to the ground, and the sound signal collected by the microphone on the ground is recorded to the ground at the same time. On the data acquisition system, research and analyze the relationship between vehicle driving noise and vehicle operating status

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