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전기자동차 소리발생 관련 국제기준개발 동향 및 음압레벨 연구
박진우(Jinwoo Park),이균석(Kyunseok Lee),배중호(Jungho Bae),권해붕(Heaboung Kwon) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The environmental benefits achieved by electric and hybrid electric road transport vehicles(EV/HEV) reduced fossil fuel demands and very quiet vehicle operation at low speeds. EV and HEV have the advantage of being more environmentally friendly and quieter than internal combustion engine vehicles. But reduced noise can also lead to potentially dangerous situations for pedestrians when an oncoming vehicle is inaudible due to background noise and low sound level of vehicles. So the installation of a device to provide sound as loud as the conventional vehicles has been discussed as a counter action against the quietness problem. Measures to deal with the quietness problem are currently being discussed by many governments. As an international agreement of these actions, a special informal group called "Quiet Road Transport Vehicles(QRTV)" was established in 2010 to deal with this problem within the Working Party on Noise(GRB), a subsidiary body of the UN/ECE/WP29. The system is called the Acoustic Vehicle Alerting System(AVAS). So external acoustic warning system should be provided to the vehicle. The system should automatically emit a sound when the vehicle is driven at a speed of less than 20km/h; the sound should be a continuous sound that evokes the running condition of a vehicle. We tested EV and ICEV and this system according to the GRB guidelines, the sound level is not exceed approximately 60dB at a 2m distance from the center of the vehicle.
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최동석(Dongseok Choi),이정기(Jungki Lee),이광범(Kwangbum Lee),권해붕(Heaboung Kwon),용기중(Geejoong Yong) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The concept of system power for motor vehicles becomes necessary because multi power sources and drivetrain are adapted in motor vehicles for the energy savings and the precise emission controls. System power is defined as the power is measured on the powertrain test bed. It is possible to measure the wheel torque precisely using the powertrain test bed due to the direct connection between absorber and the end of drivetrain without tire. Two different test methods were developed for system power measurement. One is the acceleration at full load under road load (i.e., Method Ⅰ); the other is the acceleration at full load under constant vehicle speed (i.e., Method Ⅱ). Test vehicles were ICEV, HEV, FCEV, and EV. The drivetrains for the vehicles were AT, CVT, and reduction gear respectively. It was found that ICEV had the lowest maximum system power by the method I due to the efficiency of the drivetrain. The other vehicles were similar results of the maximum system power for two different test methods. Therefore, it could be adopted these two methods for the measurement of system power in motor vehicles.
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