• 자동차안전학회지
• /
• 제10권1호
• /
• pp.12-19
• /
• 2018

This paper deals with the broadband electromagnetic emission test of a hybrid electric vehicle. The hybrid electric vehicle's powertrain system consists of an internal combustion engine and an EV traction motor. Depending on the SOC of the traction battery, these modes change automatically in the running state. The Korea electromagnetic compatibility regulations of KMVSS and UN WP.29 stipulated the evaluation method of hybrid electric vehicles. This study analyzes and compares two test results: internal combustion and electric motor mode. Some problems of test conditions are described and an improved test method is proposed for measuring broadband emissions of a hybrid electric vehicle. As a result, we expect this paper to be used as a consideration for improvement when test specifications are revised in the future.

• 한국자동차공학회논문집
• /
• 제24권6호
• /
• pp.694-701
• /
• 2016

According to revolutionary developments in automobile technologies, eco-friendly advanced vehicles (hybrid vehicle, hydrogen fuel-cell vehicle, electric vehicle, etc.) are rapidly increasing. The electromagnetic compatibility is getting more important for development of a vehicle because those advanced vehicles are driven by electric energy and equipped with more electric systems. In general, electromagnetic compatibility tests consist of an electromagnetic interference(EMI) test and an electromagnetic susceptibility(EMS) test. EMI test of the electric vehicles are needed not only in driving mode but also in charging mode because they must be recharged by much electric energy for driving. Depending on vehicle manufacturers, the charging device type and the location of charging device inlet in electric vehicles are various. In this paper, in order to investigate EMI of electric vehicles in charging mode in consideration of the direction of measuring antenna and the location of charging device inlet, a series of electromagnetic emission tests are conducted using three electric vehicles (neighborhood electric vehicle, electric vehicle and electric vehicle-bus). The test results show that electromagnetic emission measurements in charging mode are dependent on the direction of measuring antenna and the location of charging device inlet.

• Journal of electromagnetic engineering and science
• /
• 제11권4호
• /
• pp.304-310
• /
• 2011

The application of time-domain methods in emission measurement instruments allows for a reduction in scan time by several orders of magnitude and for new evaluation methods to be realized such as the real-time spectrogram to characterize transient emissions. In this paper two novel systems for time-domain EMI measurements above 1 GHz are presented. The first system combines ultra-fast analog-to-digital-conversion and real-time digital signal processing on a field-programmable-gate-array (FPGA) with ultra-broadband multi-stage down-conversion to enable measurements in the range from 10 Hz to 26 GHz with high sensitivity and full-compliance with the requirements of CISPR 16-1-1. The required IF bandwidths were added to allow for measurements according to MIL-461F and DO-160F. The second system realizes a system of time-interleaved analog-to-digital converters (ADCs) and has an upper bandwidth limit of 4 GHz. With the implementation of an automatic mismatch calibration, the system fulfills CISPR 16-1-1 dynamic range requirements. Measurements of the radiated emissions of electronic consumer devices and household appliances like the non-stationary emissions of a microwave oven are presented. A measurement of a personal computer's conducted emissions on a power supply line according to DO-160F is given.

• 한국산학기술학회논문지
• /
• 제21권9호
• /
• pp.397-404
• /
• 2020

현재 운영되고 있는 군 지휘·지원차량은 상용차량의 일부를 개조하여 제작되었으며, 군에서 필요한 통신장비 운용환경을 확보하기 위하여 통신실 내부에 별도의 컨버터를 장착하는 전원공급시스템이 적용되었다. 하지만, 이러한 전원공급시스템은 전자파 방사 노이즈를 발생시켜 차량에서 무전교신 시 잦은 잡음과 통신감도 저하 등의 문제점이 발생되었다. 이를 개선하기 위해, 엔진에 발전기를 추가 장착하여 통신장비에 필요한 전력을 공급받도록 전원공급시스템을 변경하였다. 추가 장착된 발전기는 통신장비가 운용되는 통신실과 완전히 분리된 엔진 룸에 위치하도록 설계되어 전원공급시스템에서 발생되는 전자파 방사 노이즈에 의한 영향을 감소시켜줄 것으로 기대되었다. 개선된 시스템의 효과를 검증하기 위하여 기존 차량과 신규 전원공급시스템이 적용된 차량에 대하여 광대역 방사시험을 각각 수행하였고 측정 결과를 비교하였다. 시험 결과 신규 전원공급시스템이 적용된 차량의 광대역 방사 노이즈는 국내 자동차 안전기준에 모두 만족하였으며, 기존 차량 대비 일부 주파수 구간을 제외한 대부분의 구간에서 감소함을 확인할 수 있었다. 특히, 차량 우측면의 수직편파 170~225 MHz 구간에서 최대 10.751 dB𝜇V/m 감소하였다.