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대형 상용 차량의 출발시 운전성 평가 방법에 관한 연구
김형균(Hyungkyoon Kim),신창우(Changwoo Shin),정춘화(Chunhua Zheng),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
A drivability of vehicle is an important factor to evaluate the vehicle performance. For the present, the evaluation of drivability is subjectively evaluated by professional test drivers. This method is difficult to analyze the drivability in regard to dynamic performance of vehicle. Especially in a heavy duty vehicle, significant problems are occurred when a vehicle starts to move. This paper proposed the method for quantification of drivability for start-up in a heavy duty vehicle to evaluate the drivability objectively by using dynamic performance data of vehicle. Proposed quantitative evaluation method for vehicle startability consisted of two categories. One is comfortability and another is dynamic performance. Based on the proposed method, vehicle startability was evaluated quantitatively under various operation conditions.
후륜측 클러치 조작 횟수에 따른 4WD 하이브리드 시스템의 백워드 시뮬레이션 방법
김형균(Hyungkyoon Kim),차석원(Sukwon Cha),임원식(Wonsik Lim),강상욱(Sangwook Kang) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
A 4WD hybrid system has two powertrains, one is operated by engine for front wheels, another is operated by motor for rear wheels. This System was developed for substituting conventional 4WD vehicles. Advantages of 4WD hybrid system are follows. First, it has less power transfer loss because there are no transfer and propeller shaft. Second, fuel economy of this system can be improved by using regenerative braking and Idle Stop & Go. To maximize these advantages, it is important to establish the control strategy for driving status. One of the ways for establishing the control strategy is backward simulation by using Dynamic Programming. However, because the result by using this method is for ideal driving status, direct application for control strategy by using this result is difficult. Therefore, considering real conditions for backward simulation is needed. In this research, backward simulation for 4WD hybrid system is implemented by considering one of real conditions which is the number of the operation of rear clutch.
E-4WD HEV의 INLINE 후륜 구동측 감속비 최적화에 관한 연구
김형균(Hyungkyoon Kim),신창우(Chang Woo Shin),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
E-4WD HEV is the vehicle which has two powertrains, one is operated by engine for front wheels, another is operated by motor for rear wheels. This System was developed for substituting conventional 4WD vehicles. Advantages of E-4WD are follows. First, it has less power transfer loss because there are no transfer and propeller shaft. Second, fuel economy of this system can be improved by using regenerative braking and Idle Stop & Go. When designing this system, it’s important to determine a reduction gear ratio for rear powertrain because vehicle performance can be improved or deteriorated through varying reduction gear ratio. This paper discusses how to determine reduction gear ratio for rear powertrain of inline system by using dynamic programming and compare fuel economy to parallel hybrid system.
신창우(Chang Woo Shin),김형균(Hyungkyoon Kim),김문겸(Mun Kyum Kim),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
A drivability of vehicles means subjective perception for dynamic performance and comfort of a vehicle in response to driver input. Subjective evaluations by experienced test driver have been primarily used to assess the drivability in automotive companies. These evaluations are limited in repeatability and require much time and cost. In this paper, vehicle test was conducted to measure data for objective drivability evaluations in heavy duty vehicles. The evaluation indices for drivability were selected from references, which are related to ride comfort and objective evaluation of drivability, according to operation conditions. The quantitative evaluation method was proposed by using weighting factors obtained from the regression analysis of subjective evaluations. Based on the proposed method, drivability for heavy duty vehicles was evaluated quantitatively under various operation conditions. The results of this evaluation were similar to those of subjective evaluation.
타이어 슬립 모델을 고려한 4륜 구동 하이브리드 전기 차량의 동적 최적화 기반 후뱡향 시뮬레이션 프로그램 개발
정종렬(Jongryeol Jeong),김형균(Hyungkyoon Kim),임원식(Wonsik Lim),차석원(Suk Won Cha),강상욱(Sangwook Kang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Inline system 4WD hybrid electric vehicle is driven by engine and motor which are connected different tire axis independently. Front wheel of the vehicle is driven only by the engine which is exactly the same with conventional vehicle. On the other hand rear wheel of the vehicle is driven by the motor so that the vehicle can be driven in electric vehicle mode, hybrid electric vehicle mode, engine only mode and regenerative braking mode as similar as the typical parallel hybrid electric vehicle. In this paper, a backward simulation program applied by dynamic programming which has tire slip model based on the vehicle dynamics was developed to express the characteristics of 4WD hybrid electric vehicles. It is possible to calculate the optimal fuel economy and other various status of the vehicle when the vehicle follows the given driving cycle. It is considered that optimization of the vehicle components and development of control logic for the vehicle are possible to utilize the backward simulation program.
정춘화(Chunhua Zheng),김모성(Moseong Kim),김형균(Hyungkyoon Kim),박영일(Yoeng-il Park),차석원(Suk Won Cha) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In a fuel cell hybrid vehicle (FCHV), the operating points of the fuel cell system (FCS) can be shifted to its high-efficiency region by using a battery and the total hydrogen consumption depends on power management strategies. Two types of power management strategies are presented in this paper and the concept of equivalent hydrogen consumption is applied to this study due to the difference between the initial and final SOC of the battery. The equivalent hydrogen consumption of each strategy is evaluated and compared to each other.