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신창우(Changwoo Shin),임종욱(Jongwook Lim),이대흥(Daeheung Lee),임원식(Wonsik Lim),차석원(Sukwon Cha),박태식(Taesik Park),김석준(Seokjoon Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Drivability is an important evaluation of vehicle performance and means subjective perception for dynamic performance of a vehicle in response to driver input. For the present, drivability evaluation is subjectively evaluated by professional test drivers. This paper proposed the method for quantification of drivability in Hybrid Electric Vehicles (HEV). Proposed quantitative evaluation method consisted of five evaluation indices. The indices for drivability evaluation were selected through references which are related to ride comfort and shift quality. Based on the proposed method, drivability of HEV was evaluated quantitatively under various operation conditions. The results of these evaluations were similar to that of subjective evaluations under the same conditions.
신창우(Changwoo Shin),정종렬(Jongryeol Jeong),임원식(Wonsik Lim),차석원(Sukwon Cha),이춘범(Chunbeom Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
It is possible to estimate regenerative braking energy on an electric bus with a fixed driving cycle. However, in low vehicle speed ranges, it is difficult to regenerate, because of the low motor electromotive force generated at low motor rotational speeds. Thus the most important thing of electric vehicles is their ability to recover amounts of braking energy with considering vehicle safety. This paper shows amounts of traction and braking energy of bus driving cycles, which are composed of Seoul city bus cycles. A regenerative braking control algorithm is proposed considering low vehicle speed ranges and braking force distribution on front and rear wheel. A forward simulation program is developed to investigate fuel efficiency by limit speed of the regenerative braking algorithm. Based on the simulation results by limit speed, fuel efficiency for an electric bus is compared according to the bus driving cycles. Results of the comparison suggest an appropriate driving cycle for the target vehicle.
전기 버스의 감속비 최적화를 위한 주행 성능 시뮬레이션 분석
신창우(Changwoo Shin),정종렬(Jongryeol Jeong),임원식(Wonsik Lim),차석원(Sukwon Cha),이춘범(Chunbeom Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
There have been efforts to enhance the efficiency of electric vehicle Electric vehicles. One of these is the optimal reduction gear ratio, because operating points of traction motor are revised according to a reduction gear ratio. This paper proposed a design method for the optimal reduction gear ratio of an electric bus using a motor efficiency according to bus test driving cycles. For optimal gear ratio, analysis for test driving cycles was performed. To investigate the effect of the optimal gear ratio, backward simulation was conducted to confirm a variation of SOC(state of charge) for bus test driving cycle according to various reduction gear ratio. Simulation result using the optimal gear ratio was compared with those of other cases.
락업클러치 작동에 따른 구동계의 이상 진동에 관한 연구
신창우(Changwoo Shin),이대흥(Daeheung Lee),임원식(Wonsik Lim),차석원(Sukwon Cha),김진현(Jinhyun Kim),강상욱(Sangwook Kang) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Lock-up clutch system has been widely adapted to the present automatic transmission vehicles for reducing fuel consumption and improving efficiency of vehicle drivetrain system. However, the abnormal vibrations such as slip shudder and surge might be happened by the lock-up clutch operation at the low speed. In this paper, we focused on the abnormal vibrations in the unstable regions of the engine performance curve. Based on the dynamic equations of vehicle system, we designed simulation program which includes engine, torque converter, lock-up clutch, transmission and vehicle. To analysis the abnormal vibrations in drivetrain, we carried out simulations for several driving conditions according to unstable regions of engine performance curve. As a result of simulation, the abnormal vibrations in drivetrain are severely occurred in unstable regions of an engine. Thus, lock-up clutch operation would be better to avoid in this region.
AT 차량의 댐퍼클러치 작동에 의한 연비와 이상진동 분석
신창우(Changwoo Shin),김범수(Beomsoo Kim),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Automatic transmission vehicles have steadily increasing due to convenience and comfort for drivers. A damper clutch in automatic transmission system has some advantages of fuel economy and dynamic performance. In this paper, dynamic modeling was performed to confirm the effects of damper clutch operation. Using simulation program, fuel economy on a system with a lock-up control was compared with that on a system with a slip control on a test cycle. The result of simulation also depicted abnormal vibration during damper operation at low throttle condition. To analyze the abnormal vibrations in the drivetrain, simulations for several driving conditions was conducted. Two sides by a damper clutch operation were confirmed.
정춘화(Chunhua Zheng),신창우(Changwoo Shin),김규식(Kyu-sik Kim),이봉현(Bong-hyun Lee),임원식(Wonsik Lim),강상욱(Sangwook Kang) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Electric Vehicles (EVs) have become huge issues these days because of energy resource and environmental problems. EVs have many outstanding advantages such as zero emission and independence from petroleum, but more importantly, it has the ability of recovering braking energy. In this research, an EV simulation program is created to study each EV component and the controller which is including a braking algorithm.
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.