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    • Experimental Analysis on Air Flow Pulsation and Vibration Noise of Automobile Fuel Evaporation Recovery System
    DOI：10.13949/j.cnki.nrjgc.2022.01.008
    Key Words:pressure pulsation  velocity pulsation  solenoid valve  duty cycle  air hammer effect  noise  vibration
    Author NameAffiliationE-mail
    TIAN Shaojun* SAIC-GM-Wuling Automobile Co.， Ltd.， Liuzhou 545007， China t13307723277@163.com 
    LI Qian SAIC-GM-Wuling Automobile Co.， Ltd.， Liuzhou 545007， China  
    CHANG Guangbao SAIC-GM-Wuling Automobile Co.， Ltd.， Liuzhou 545007， China  
    WANG Yulei SAIC-GM-Wuling Automobile Co.， Ltd.， Liuzhou 545007， China  
    WANG Kun SAIC-GM-Wuling Automobile Co.， Ltd.， Liuzhou 545007， China  
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    Abstract:A signal generator was used to generate pulse width modulation（PWM） signal to simulate the opertion of solenoid valve driven by engine electronic control unit. Different output characteristics of fuel evaporation recovery system were obtained by changing PWM signal frequency， duty cycle and vehicle operating conditions. The variation laws of air flow pulsation， structural vibration and vehicle interior noise with the control signal of solenoid valve were analyzed. The dynamic model of solenoid valve was established. The analysis of the dynamic of solenoid valve and the comprehensive analysis with the test data were carried out. The analysis results show that the vibration of the solenoid valve is mainly caused by the closing of the valve. The knocking noise in the vehicle comes from the air pulsation knocking on the carbon canister after the solenoid valve is closed. The carbon canister vibration is transmitted to the vehicle body and the vibration of the vehicle body radiates noise. The vibration and noise increases with the increase of PWM frequency of solenoid valve， and the amplitude of air pressure fluctuation in the system decreases with the increase of frequency. Under the same duty cycle， the time average value of air pressure increases with the increase of frequency. The rectifier diodes are connected in reverse parallel at both ends of the solenoid valve coil， and the orifice plate is set at the air inlet pipe of the solenoid valve body， which can reduce the air pulsation caused by the opening and closing movement of the solenoid valve and the vibration of the solenoid valve and carbon canister， eliminating the knocking noise in the vehicle.
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