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정우현(Woohyeon Jeong),김주연(JooYeon Kim) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
The automatic transmission parking system functions essentially as a minimum safety device for the vehicle by mechanical locking when the engine stop or electric power interruption. Parking system exists in various shapes in all vehicles including automatic transmissions of internal combustion engines and hybrid vehicle (AT, DCT, CVT, etc.) and electric vehicle reducer. And the vehicle should keep stationary when braking or gradient conditions. Therefore, parking system must satisfy function and performance in order to secure reliability even under repeated load conditions. Parking test has various evaluation items for each car maker, and It has criteria for evaluating durability and performance. In this paper, when the parking cam is damaged by repeated parking operations during the parking durability test, characteristics of the parking system operating behavior due to cam’s rotation were compared and verified by multibody dynamics simulation.
정우현(Woohyeon Jeong),김주연(Jooyeon Kim) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
With the spread of electric vehicles, the market share of electric vehicles among global automobile sales is gradually increasing and it has continued to grow with a market share of 10% in 22. However, with the supply of electric vehicles, there are still problems to be solved, such as mileage problems depending on battery capacity, inconvenience in charging time and place, high vehicle prices compared to internal combustion engines due to battery prices, and uncertainties in subsidies. In the case of 4WD vehicles, there is driving stability due to road conditions and driving force distribution. Compared to internal combustion engines, electric vehicles have advantages such as spatial advantage and high output due to the application of two motors. Despite these advantages, 4WD electric vehicles need to improve efficiency due to their lower electricity ratio than 2WD. Among them, efficiency improvement through DAS application has been verified through various researches. Existing DAS simulations mainly focused on the simulation of vehicle perspectives using 1D simulation. In this research, a control simulator was developed to verify the behavioral characteristics during DAS engagement, and a multi-body dynamics analysis model was developed for precise verification of parts unit.
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.
자동차용 동력전달장치의 파킹 시스템 오용차속 검증 방법 개선에 관한 연구
김주연(Jooyeon Kim),정우현(Woohyeon Jeong),박찬서(Chanseo Park),박경민(Kyungmin Park) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
In the 21st century, the driving system of automobiles is changed gradually from internal combustion engines to electric vehicles. As for many mechanical devices are disappearing due to Electrification in the development trend of existing vehicles, but parking systems in charge of safety functions still exist. In the past, the purpose of the vehicle safety function was to operate the p-range due to the mistake of driver while driving the vehicle, but it is currently designed to safely stop the car if the motorized system is inoperable. At this time, a phenomenon called ratcheting occurs in the parking system, and the moment when the parking gear and the sprag are engaged is called a lock vehicle speed. Previous design and simulation review methods had errors in the calculation of the lock speed. To solve this problem, developing an automatic parameter calculation toolkit for locking speed in parking system, and modifying the simulation method. It was compared with test data to confirm the improvement effect of the design toolkit and analysis results.
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.
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.