Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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A Study on Characteristics of Injected Fuel Pressure Waves of a Solenoid Type Diesel Common Rail Injector with Controlling Current Wave for Driving the Injector

솔레노이드 타입 디젤 커먼레일 인젝터 구동을 위한 전류 파형 변화에 따른 분사 연료 압력파 특성

  • 김길태 (서울과학기술대학교 산업대학원 자동차공학과) ;
  • 이충훈 (서울과학기술대학교 기계자동차공학과)
  • Received : 2016.08.08
  • Accepted : 2016.09.06
  • Published : 2016.09.30
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Abstract

Injected fuel pressure waves of a common rail injector with various current profiles supplied to the injecor were measured using Bosch method. In order to drive the common rail injector, the current in the solenoid should be controlled using what is known as a peak and hold pattern, which consists of a high current level with a short time duration (peak) in the first step and a low current level with a long time duration (hold) in the subsequent step. The current profile can be shaped by swithcing an injector driving power source with the peak and hold waves. The capture, compare and PWM (CCP) pin in the microprocessor was used to generate the combined peak and hold waves. The PWM square wave generated from the CCP pin has a duty ratio of 100% for the peak current and 10% or 30% for the hold pattern. Five patterns of the current profile were generated by combining the peak and hold wave. The common rail pressure is controlled at 75, 100, and 130 MPa. As the fuel rail pressure increases, the variations of the measured fuel injection pressure wave according to the current profiles decrease.

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References

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