Abstract
In the development process of a certain CHINA VI proprietary brand car model, there exists the problem of intermittent “dada” sound in the cockpit during idling. After investigation, it’s determined that the air pulse noise generated when the canister purge solenoid valve is working, it is transmitted to the car panels through the pipeline, and then to the cockpit, which would cause a “dada” sound. By adding expansion chamber in the desorption pipe and designing part of the pipeline which fixed in the clamp as rubber pipe, the intensity of air pulse can be effectively reduced and the transmission path of air pulse vibration can be blocked. Through objective testing and subjective evaluation, the scheme can greatly reduce the idle noise of the cockpit, thus improving the NVH performance of the vehicle and bringing comfortable riding environment to the passengers.
Highlights
With the emergence of environmental pollution problems, the domestic and foreign requirements for vehicle emissions are increasingly stringent
The “rattle” sound during idling in the cockpit which caused by the working noise of the carbon tank solenoid valve, is a common NVH problem in the development of China 6 vehicle
This is the inevitable result of the increase of carbon tank desorption flow of China 6 vehicle, and it is related to the working characteristics and structure of the carbon tank solenoid valve itself
Summary
With the emergence of environmental pollution problems, the domestic and foreign requirements for vehicle emissions are increasingly stringent. Taking into account more stringent testing conditions and procedures, the requirements for control of fuel evaporation emissions of China 6 are at least 80% higher than China 5 requires [3]. The working noise of the carbon tank solenoid valve will be transmitted to the cockpit, causing intermittent "rattle" sound in the car, bringing uncomfortable experience to drivers and passengers. This paper focuses on the effective solution to idle "rattle" noise in the cockpit, mainly studying the mechanism and transmission path of working noise of carbon tank solenoid. By implementing muffling scheme in the fuel desorption pipe and blocking the noise transmission path, the problem of idle “rattle” noise in the cockpit can be effectively solved
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