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5사이클 시험 및 실 주행 데이터를 이용한 공회전제한 장치의 연비개선효과
이현직(Hyeonjik Lee),이기형(Kihyung Lee) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.6
The idle stop-start technology has an excellent fuel economy improvement effect in the certification cycle and can be recognized for its additional off-cycle credit. Therefore, its installation rate is gradually increasing with its perception as a useful device for meeting the reinforced fuel economy standard. However, due to the technical characteristics of the technology, its effect can be expected only in heavy traffic, and its usage rate may be limited in various environments such as a low outside temperature, a sloped road, and air conditioning operation. Therefore, research is lacking on the effect of improving fuel economy on real roads. In this study, a five-cycle test was conducted with a sports utility vehicle that had a 2.0-liter turbocharged GDI engine with an idle stop-start function, and big data from real road driving conditions were collected and analyzed using telematics information. Finally, the effect of the idle stop-start technology on fuel economy improvement was evaluated and compared with the laboratory results.
김유성,김경호,유승헌,김수경,이승엽 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.4
Dynamic Load/unload (L/UL) mechanism is an alternative to the contact start stop (CSS) technology which eliminates striction and wear failure modes associated with CSS. Inertia latch mechanism becomes important for mobile disk drives because of non operating shock performance. Various types of latch designs have been introduced in hard disk drives to limit a rotary actuator from sudden uncontrolled motion. In this paper, a single spring inertia latch is introduced for a small form optical disk drive, which uses a rotary actuator for moving an optical pick-up. A new small inertia latch with sin91e spring is designed to ensure both feasible and small size. The shock performance of the new inertia latch is experimentally verified.