A Study on the Effect of Valve Timing on the Performance and Idle characteristics of 3-Cylinder LPG Engine

밸브 타이밍 변화가 3기통 LPG 엔진의 성능과 Idle 특성에 미치는 영향에 관한 연구

  • 이지근 (정회원, 전북대학교 대학원 정밀기계공학과) ;
  • 이한풍 (아시아자동차 기술연구소 엔진설계부) ;
  • 노병준 (정회원, 전북대학교 기계공학부)
  • Published : 1997.05.01

Abstract

The effects of the intake and exhaust valve timing to improve the engine performance in a spark ignition 3-cylinder LPG engine with a closed loop fuel supply system were studied. The engine torque and power have been measured using the 75kW EC-dynamometer while adjusting the optimal fuel consumption ratio with a solen- oid driver. As the results from this experiment, when intake valve opening is $12^{\circ}$ BTDC, intake valve closing is $36^{\circ}$ ABDC, exhaust valve opening is $12^{\circ}$ ATDC, and exhaust valve closing is $36^{\circ}$ BBDC respectively, the best torque characteristics in low and high speeds for a gives engine were obtained. And also we could find that the torque characteristics in low speeds were affected by the timing of exhaust valve open. An increased valve overlap by the EVC delay was ineffectual to the torque characte- ristics improvement in high speeds.

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References

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