Driving Resistance is calculated for emission test defines total vehicle resistance forces. Resistance factors of running vehicle are sum of rolling resistance, transmission loss and aerodynamic drag force. To measure this resistance, Coastdown test is conventional method and it needs a long level driving road. In this study coastdown test is executed on short driving road. And also each resistance factors are calculated. This test is based on S(Distance)-Time Method. From the result, it is shown that this method is reliable and can be used for initial vehicle test.

Abstract
1. 서 론
2. 주행저항 측정방법
    2.1 주행저항 측정을 위한 모 델링
    2.2. 시험조건
3. 부분속도 타행시험
    3.1 타이어에 의한 구동저항
    3.2 구동축 저항
    3.3 공기항력 검증
4. 실제 주행저항 결과와 비교
    4.1 실제 타행시험에 의한 결과
    4.2 결과비교
5. 결 론
References

• 김호영(Senior Manager, Engine Development Team, LS Mtron) | Ho Young Kim Corresponding author