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서희수(Heesoo Seo),김주연(Jooyeon Kim),이성훈(Sunghoon Lee),신혜정(Haejeong Shin),이상호(Sangho Lee) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Mounting a twin motor is one way to reduce the weight and size of a driving motor of an electric vehicle. When twin motors are applied, parking systems must also be applied to each motor, so mechanical considerations are more complicated. Double parking systems require additional performance review items from existing parking systems. For double parking systems, scenarios that were not considered in the single type, such as left/right asymmetry and the force required to operate both systems, should be considered. The simulation was studied in terms of safety functional aspects, which are the original purpose of the parking system, and emotional quality aspects closely related to safety.
전기차용 안전 기구 시스템의 작동 시 발생하는 차량 선회에 관한 연구
서희수(Heesoo Seo),김주연(Jooyeon Kim),정우현(Woohyeon Jeong),김남욱(Namwook Kim) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
Independent driving systems are being developed to improve the driving performance and control precision of electric vehicles. There are types such as twin motors and in-wheel motors, and in this case, the safety mechanism system should also be applied to the left and right side independently. Among the various scenarios of the parking system, a safety mechanism system, there may be a difference in left and right lock-up timing when operating the P stage during driving. Through this scenario, the difference in lock-up timing was checked for each vehicle specification. The amount of turn (the amount of lane departure) was calculated and reviewed in terms of road standards and regulations.
캠타입 구동방식의 신규 파킹시스템의 다물체 동역학 해석 모델 개발
김주연(Jooyeon Kim),정우현(Woohyeon Jeong),서희수(Heesoo Seo),신혜정(Haejeong Shin),이상호(Sangho Lee),김남욱(Namwook Kim) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
A conventional parking system of automobile is built in an automatic transmission(AT). This system is responsible for the safety performance and sends the drivers intention to the vehicle. In checking these functions, a design verification has been performed by using three indicators through the simulations of multibody dynamics. This analysis technique was applied to the development of parking systems suitable for the number for vehicles, the error from the test was satisfied within 10% on average. For the cost down purpose, a new parking system has been developed that can perform the original function with a simpler structure than the conventional type. The Grubler formula was used to determine the structural complexity of the parking system. The new system consists of a rotating cam drive type, not a rod assembly type. When new system was applied to the vehicle, it was verified by using the simulation that had the same performance characteristics as the conventional system. As a result, it was confirmed that it could be used.
자동차 조작계용 판스프링의 내구수명 검토 기법에 관한 연구
김주연(Jooyeon Kim),정우현(Woohyeon Jeong),서희수(Heesoo Seo) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Almost vehicles have parking systems that function to set safety devices and driving modes, which exist in the form of gear knobs, button types, and rotation types. Here, the driving mode is familiar with the form of P-R-N-D-S, and recently, it has changed into a simple system of P-Not P mode. This can be expressed as a shift by wire (SBW) type that operates the gear knob with a human hand (SBC: Shift By Conventional type), and the mechanical principle driven by each range is the same. This system is designed to prevent the sprag from rotating the gear when the parking gear is stopped (P), and the sprag must be released from the gear to drive the vehicle when driving or reversing (D or R). In addition, parking on ramps requires more force than flat ground, so it has been calculated through design sheets or multibody dynamics analysis to calculate the force required to operate this system. In order to check various designs, it is difficult to respond through the simulation of a parking system using a rigid body in order to review the life of a flat spring mounted on the operating system. In this paper, a method of predicting fatigue life was presented through test and flexible body dynamics analysis (Ansys motion) to expect the flat spring durability of the operating system during the initial layout design stage of the new parking system to improve this problem.