In this paper, we investigate the relationship between fuel injection quantity and voltage and current energy of Bosch system and Delphi system by measuring the high and low voltage waveform, current waveform, fuel injection quantity and fuel pressure of A and J-engines. Waveform measurements are made using the PICO scope and the CDS tester. The injectors of A and J engines were tested under no load condition using injector with normal fuel injection quantity, injector with small fuel injection quantity and injector with many fuel injection quantity. In case of normal injector, A-engine has higher fuel pressure, injection interval time, voltage energy, and current energy than J-engine. The current energy of the A-engine changed linearly compared to that of the J-engine. For over and under injectors, the change in the previous physical quantity was greater for the A-engine than for the J-engine. However, the duration time of maintaining to open the injector is controlled differently, and so the voltage and current energy values are changed, and the change of the current energy is larger than the voltage energy.

ABSTRACT
 1. 서 론
 2. 이론적 연구
  2.1 제어 회로
  2.2 솔레노이드 전압파형과 전류파형
 3. 실험장치의 구성과 방법
  3.1 실험 장비
  3.2 실험 방법
 4. 실험결과 및 고찰
 5. 결 론
 References

• 강성구(Technical Support Team Leader of SeoKwang Automotec Co., Ltd.) | Sung-Gu Kang
• 김철수(School of Mechanical and Automotive Engineering of Gangneung-Wonju National University) | Chul-Soo Kim Corresponding Author