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Common Rail Pressure Control Algorithm for Passenger Car Diesel Engines Using Quantitative Feedback Theory

QFT를 이용한 디젤엔진의 커먼레일 압력 제어알고리즘 설계 연구

  • 신재욱 (한양대학교 자동차공학과) ;
  • 홍승우 (한양대학교 자동차공학과) ;
  • 박인석 (한양대학교 자동차전자제어 연구소) ;
  • 선우명호 (한양대학교 자동차공학과)
  • Received : 2013.02.13
  • Accepted : 2013.11.25
  • Published : 2014.02.01

Abstract

This paper proposes a common rail pressure control algorithm for passenger car diesel engines. For handling the parameter-varying characteristics of common rail systems, the quantitative feedback theory (QFT) is applied to the design of a robust rail pressure control algorithm. The driving current of the pressure control valve and the common rail pressure are used as the input/output variables for the common rail system model. The model parameter uncertainty ranges are identified through experiments. Rail pressure controller requirements in terms of tracking performance, robust stability, and disturbance rejection are defined on a Nichols chart, and these requirements are fulfilled by designing a compensator and a prefilter in the QFT framework. The proposed common rail pressure control algorithm is validated through engine experiments. The experimental results show that the proposed rail pressure controller has a good degree of consistency under various operating conditions, and it successfully satisfies the requirements for reference tracking and disturbance rejection.

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