Kyoung-Seok Park

Development and Application of High Energy Ignition System Using Plasma

This study is a follow-up study of “Development of Plasma Ignition System” was presented at the 2013 KSAE spring conference. This study compares lean limit of conventional ignition system with plasma ignition system on constant volume combustion test & Engine Combustion test.

Improvement of Fuel Economy of a City Bus using Shift Indicator

The gear shifting timing of a manual transmission vehicle is influencing fuel economy. This paper focuses on an gear shifting indicator of an city bus with manual transmission, which can improve fuel economy. The shift indicator is supposed to collect the vehicle data during driving, calculate and compare fuel economy with and without gear shifting, and indicate the proper gear shifting timing. The H/W and S/W of the shift indicator are developed and tested on city bus in this research. The experiments are carried out on real road by 3 different drivers and the results show the improvement of fuel economy from 6.0% to 21.4%. The average engine torque and speed are reduced due to early gear shifting and the usage of highest gear is increased. The results of chassis test are also performed and show 7.5% improvement of fuel economy.

The Effect of Cooling Fan Control on Fuel Economy of City Bus

Abstract : This paper focuses on cooling fan control by using a magnetic clutch type for the improvement of fuel economy on a heavy city bus. In general, Heavy duty vehicles use viscous clutch type cooling fan which has some disadvantages, such as slow response, wide temperature variation of engine coolant water. But a magnetic clutch type cooling fan can be controlled electronically so the engine coolant temperature can be precisely controllable and this effects could be used to reduce fuel consumption. A control system for applying the magnetic clutch type cooling fan was developed in this study and applied to the real field test and chassis dynamometer test. The result showed well controlled coolant temperature and enhancement of fuel economy. Key words : Vehicle thermal management system(능동형 열관리장치), Electronic clutch cooling fan(전자식 클러치 냉각팬), Viscous clutch cooling fan( 유체 클러치 냉각팬), CNG bus(CNG 버스), Fuel economy(연비) 1. 서 론 1) 2001년 11월 교토의정서 공표 이후 온실가스 배출량 감소를 위한 국제적 노력이 활발하게 진행되고 있으며 이에 따라 선진국들은 2008년부터 2012년까지 전체 온실가스 배출량을 1990년 대비 5.2% 감축하기로 합의하였다.