ABS 의무장착 및 신차종 도입에 따른 마찰계수 현행화 연구
Update of Friction Coefficients Due to Mandatory ABS Installation and Introduction of New Vehicle Types
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초록
본 연구에서는 실차 급제동 테스트를 통해 ABS가 의무장착된 차량들의 마찰계수와 마찰계수데이터가 전무하였던 전기자동차 마찰계수를 현행화하고자 한다. 이를 위해 차종을 세단과 RV (Recreational Vehicle), 그리고 전기자동차로 구분하여 건조한 노면과 습윤한 노면에서의 급제동테스트를 실시하였다. 급제동 테스트로 수집된 마찰계수 데이터 중 이상치를 제거하였으며, 이러한 데이터 전처리 후 차종 간 마찰계수 차이점을 도출하기 위하여 Welch’s t-test를 실시하였다. Welch’s t-검정 결과 건조한 노면에서는 세단과 전기자동차 간의 마찰계수에는 차이가 없는 것으로 분석되었으나 RV와 세단 그리고 전기자동차 간의 마찰계수는 통계적으로 차이가 있는 것으로 분석되었다. 반면 습윤한 노면에서는 세단, RV 그리고 전기자동차 마찰계수에 차이가 없는것으로 분석되었다. 따라서 본 연구에서는 건조한 노면에서 세단과 전기자동차의 마찰계수는0.93, RV의 마찰계수는 0.90 습윤한 노면에서는 3차종의 마찰계수를 0.73으로 제시한다.
Abstract
This study aims to update the friction coefficients of vehicles equipped with mandatory ABS and establish the friction coefficient data for electric vehicles, which have previously lacked such data, through actual vehicle emergency braking tests. For this purpose, the vehicles were categorized into sedans, recreational vehicles (RVs), and electric vehicles. The emergency braking tests were conducted on both dry and wet road surfaces. Outliers from the collected friction coefficient data were removed during data pre-processing. A Welch’s t-test was conducted to identify the differences in friction coefficients between vehicle types. The Welch’s t-test results indicated that, on dry road surfaces, there was no significant difference in friction coefficients between sedans and electric vehicles; however, a statistically significant difference was found between RVs and electric vehicles. On wet road surfaces, no significant difference in friction coefficients was observed among sedans, RVs, and electric vehicles. Therefore, this study presents friction coefficients of 0.93 for sedans and electric vehicles and 0.90 for RVs on dry road surfaces, while on wet road surfaces, the friction coefficient for all three vehicle types is 0.73.
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