Journal of Aerospace System Engineering (항공우주시스템공학회지)

The Society for Aerospace System Engineering (항공우주시스템공학회)
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Pressure Control of Brake Circuit with Piezoelectric-hydraulic Pump Using Pressurization/Depressurization Characteristics

압전유압펌프가 적용된 브레이크 회로의 가감압 특성을 이용한 압력 제어

  • Hwang, Yong-Ha (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Hwang, Jai-Hyuk (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Bae, Jae-Sung (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Kwon, Jun-Yong (The 7th Research and Development Institute, Agency for Defense Development)
  • 황용하 (한국항공대학교 항공우주 및 기계공학과) ;
  • 황재혁 (한국항공대학교 항공우주 및 기계공학과) ;
  • 배재성 (한국항공대학교 항공우주 및 기계공학과) ;
  • 권준용 (국방과학연구소 제7기술연구본부)
  • Received : 2017.05.09
  • Accepted : 2017.06.20
  • Published : 2017.06.30
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Abstract

In this paper, an equivalent brake hydraulic circuit with a piezoelectric hydraulic pump was constructed, and load pressure control for better pressurization/depressurization characteristics was conducted. To understand pressurization/depressurization characteristics of the equivalent hydraulic circuit, the relation between the load pressure and the input voltage was revealed experimentally. Experiments were also conducted to observe effect of the solenoid valve on depressurization characteristics. In the pressurization experiment, it was validated that transient response time required to achieve desired load pressure may be reduced through voltage control to change pressurization gradient. By applying the valve on/off time control and voltage control, it was also possible to reduce response time in the depressurization process. Therefore, transient response time may be improved within 10ms for pressurization and within 30 ms for depressurization using the control technique suggested in this study. The load pressure control method proposed in this study is useful for controlling load pressure of a hydraulic brake system with the piezoelectric hydraulic pump.

본 논문에서는 압전유압펌프가 적용된 브레이크 등가 유압회로를 구성하고, 유압회로의 가감압 특성 실험 및 부하압 제어에 대한 연구를 수행하였다. 유압회로의 가감압 특성을 파악하기 위해 펌프 입력 전압에 따른 부하압 형성 실험을 수행하였고, 솔레노이드 밸브 특성이 감압에 미치는 효과를 파악하는 실험을 수행하였다. 가압 특성 실험을 통해 유압회로의 부하압 상승에 필요한 과도응답시간은 압력상승 구배를 조절하는 전압제어를 적용하여 개선할 수 있음을 확인하였고, 감압시는 솔레노이드 밸브 특성을 활용한 밸브 개폐시간 제어와 전압제어를 통해 과도응답시간 개선이 가능함을 확인하였다. 본 연구에서 개발된 제어기법을 적용하여 부하압 제어실험을 수행한 결과, 가압의 경우 10ms 이내로, 감압의 경우 30ms 이내로 과도응답시간을 개선할 수 있었다. 본 연구에서 제안된 부하압 제어기법은 압전유압펌프가 적용된 유압 브레이크 회로의 부하압을 제어하는데 매우 유용할 것으로 판단된다.

Keywords

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