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Braking Force Test Evaluation Dynamometer Development of Vehicle

차량용 브레이크 제동력 평가 다이나모미터 개발

  • Kwon, Byeong-Heon (Department of Mechanical Engineering, Keimyung University) ;
  • Yoon, Pil-Hwon (Department of Mechanical Engineering, Keimyung University) ;
  • Lee, Seon-Bong (Division of Mechanical and Automotive Engineering, Keimyung University)
  • 권병헌 (계명대학교 기계공학과) ;
  • 윤필환 (계명대학교 기계공학과) ;
  • 이선봉 (계명대학교 기계자동차공학과)
  • Received : 2018.08.14
  • Accepted : 2018.11.02
  • Published : 2019.05.31

Abstract

Recently, automobiles have been developed for safety and environmental reasons. Particularly, awareness of automobile safety is changing significantly. As a result, safety systems developed by ADAS have emerged. However, the period of mass production through ADAS development and test evaluation is long. Therefore, in this paper, we develop a brake dynamometer to shorten the time required for ADAS development and test evaluation. In addition, the developed brake dynamometer satisfies the international standard JIS D-0210, and the user can evaluate the braking force by selecting test conditions and test method for each mode of ADAS. We use the ACC, LKAS, and AEB scenarios proposed in previous studies to verify the reliability of the developed brake dynamometer. The developed brake dynamometer was verified by comparing the test values and the calculated values using theoretical formulas of the proposed ADAS mode based on previous studies. In addition, it is expected that the performance evaluation of brake parts for each ADAS mode will be possible in an environment where the vehicle test of ADAS is not possible in the future.

최근 자동차는 안전성, 편리성, 친환경 등의 목적으로 개발되고 있다. 특히, 자동차 안전성에 대한 인식이 중요하게 바뀌고 있다. 이에 따라, ADAS 개발로 인한 안전 시스템들이 등장하였다. 그러나 ADAS의 개발과 시험 평가를 통해 양산 되는 기간은 상당히 오래 걸린다. 따라서 본 논문에서는 ADAS 개발과 시험 평가에 필요한 기간을 단축시키기 위해 브레이크 다이나모미터를 개발 하였다. 또한 개발한 브레이크 다이나모미터는 국제 표준인 JIS D-0210을 만족하며, ADAS의 모드별로 사용자가 시험 조건과 시험 방법을 선택 하여 제동력을 평가할 수 있다. 그리고 개발하는 브레이크 다이나모미터의 신뢰성 검증을 위해 선행 연구에서 제안한 ACC, LKAS, AEB의 시나리오를 사용하였다. 개발한 브레이크 다이나모미터는 시험값과 선행 연구를 통해 제안된 ADAS 모드별 이론식에 의한 계산값을 비교하여 신뢰성을 검증하였다. 또한, 향후에는 ADAS의 실차시험이 불가능한 환경에서 ADAS 모드별 브레이크 부품의 성능 평가가 가능할 것으로 기대 된다.

Keywords

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Fig. 1. ACC scenario(Stop&Go)

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Fig. 2. LKAS scenario(constant steering)

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Fig. 3. AEB scenario(CCRs)

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Fig. 4. Brake dynamometer diagram

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Fig. 5. Brake dynamometer mechanical part

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Fig. 6. Brake dynamometer hydraulic & pneumatic part

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Fig. 7. Temperature and humidity graph

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Fig. 8. Brake dynamometer part(a) Environment part (b) Controller

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Fig. 9. Test code edit block diagram

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Fig. 10. Data processing block diagram

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Fig. 11. Wave data processing block diagram

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Fig. 12. Brake dynamometer test results for ACC(a) Velocity (b) Brake distance(c) Deceleration (d) Torque

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Fig. 13. Brake dynamometer test results for LKAS(a) Velocity (b) Brake distance(c) Deceleration (d) Torque

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Fig. 14. Brake dynamometer test results for AEB(a) Velocity (b) Brake distance(c) Deceleration (d) Torque

Table 1. Condition of ACC scenario(Stop&Go)

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Table 2. Condition of LKAS scenario(constant steering)

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Table 3. Condition of AEB scenario(CCRs)

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Table 4. JASO C-406 test methods conditions

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Table 5. ISO-11157 vehicle category(M)

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Table 6. Brake dynamometer spec.

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Table 7. Theoretical calculation and braking time of dynamometer

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Table 8. Test result of dynamometer

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Table 9. Comparison of theoretical and dynamometer data

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