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정규홍(Gyu Hong Jung),정창도(Chang Do Jung),박세하(Se Ha Park) 유공압건설기계학회 2016 드라이브·컨트롤 Vol.13 No.1
Nowadays automatic transmission equipped vehicles prevail in construction and agricultural equipment due to their convenience in driving and operation. Though domestic vehicle manufacturers install imported electronic controlled transmissions at present, overseas products will be replaced by domestic ones in the near future owing to development efforts over the past 10 years. For passenger cars, there are many kinds of shift control algorithms that enhance the shift quality such as feedback and learning control. However, since shift control technologies for heavy duty vehicles are not highly developed, it is possible to improve the shift quality with an organized control method. A feedback control algorithm for neutral-into-gear shift, which is enabled during the inertia phase for the master clutch slip speed to track the slip speed reference, is proposed based on the power transmission structure of TH100. The performance of the feedback shift control is verified by a vehicle test which is implemented with firmware embedded TCU. As the master clutch engages along the predetermined speed trajectory, it can be concluded that the shift quality can be managed by a shift time control parameter. By extending the proposed feedback algorithm for neutral-into-gear shift to gear change and shuttle shift, it is expected that the quality of the shift can be improved.
이종찬(Jong Chan Lee),김관수(Kwan Soo Kim),임종형(Jong Hyung Yim),이효원(Hyo Won Lee),권영민(Young Min Kwon),김형준(Hyung Jun Kim),이민희(Min Hee Lee) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.7
The quality of the automatic transmission shift for a wheel loader has been generally evaluated by driver's perception. However the subjective evaluation of the drivers is not always directly related to the shift quality. It is necessary to set up the method for an objective assessment of the shift quality. In this paper, a quantitative assessment method has been developed for the shift quality of the automatic transmission in a wheel loader. The indices for the evaluation were selected through the various tests like the acceleration and the turbine rpm as well as the subjective evaluation of the driver, and were validated by the correlation between subjective and objective assessments using a psychophysical power law. Based on this method, the shift quality of a wheel loader has been evaluated quantitatively under various shift conditions.
정규홍(Gyuhong Jung),김경동(Kyungdong Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
All the automatic transmissions that are recently developed for passenger cars adopt an electronic control unit to improve fuel economy as sell as shift quality. It also applies to construction vehicles such as forklift and wheel loader as the driver’s demands for convenient operation and performance improvement in relation to repetitive tasks are increasing. After TCU decides the shift in view of transmission status and/or driver’s command, it manages the shifting process with the current control of proportional solenoid valves. Since the current trajectories of apply and release clutch during shift entirely affect the quality of shift, those should be well matched with shifting conditions. This paper briefly describes the development of shift data matching program which enables the design of shift data graphically and the communication with TCU. It was utilized in the wheel loader transmission matching test and proved useful for the calibration of shift data to implement a smoothing shift.
손병길(B. G. Son),김현모(H. M. Kim),류하오(H. Liu),이재천(J. C. Lee),윤장원(J. W. Youn) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
The vehicle dynamics modeling of a forklift is necessary to improve the shift quality of the transmission. This study presents the modeling of power transmission of a forklift from the engine to the wheels including torque converter, clutch and gear train, hydraulic control system and final drive differential axle using AMESim. Simulation results show that the modeling proposed in this study is useful to analyse and optimize the shift quality of the transmission for a forklift.
오창은(Oh, Chang-Eun),신창우(Shin, Chang-Woo),임원식(Lim, Won-Sik),차석원(Cha, Suk-Won) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
In this paper, several fields for improving shift quality and mode conversion quality are presented and considered. For a series type hybrid vehicle, improving mode conversion quality is important because it changes its speed with its own motors. A parallel type hybrid vehicle usually has AT or AMT, and its motor and engine can work independently. Therefore, improving both of two qualities is equally important in this case. For a power split type hybrid vehicle, improving mode conversion quality is more important due to the existence of planetary gears which change vehicle's speed.
김연호(Yeonho Kim),이희라(Heera Lee),김백유(Beakyou Kim),김현수(Hyunsoo Kim),변성곤(Seonggon Byeon),박정우(Jungwoo Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
the newly developed electric vehicles are equipped with only single speed transmission in order to minimize the drivetrain mass, volume, cost and issue of shift quality. The cost and shift quality are main issues to extend a two or multi-speed transmission to electric vehicle even the two or multi-speed transmission provides advantages of motor size reduction and vehicle Max. speed increase as well as fuel-economy improvement compared to a single speed transmission. This paper introduces the two speed transmission using synchronizer to shift and gives feasibility study on shift quality compared to conventional Automatic transmission in compact-size electric vehicle
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.
민경휘(Gyeonghwi Min),손한호(Hanho Son),채민재(Minjae Chai),송민석(Minseok Song),홍성화(Sungwha Hong),최영선(Youngsun Choi),조성택(Sungtaeg Cho),최승만(Seungman Choi),김민효(Minhyo Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
In this paper, a dual clutch transmission(DCT) shift performance simulator were developed to evaluate the shift quality using MATLAB/Simulink and SimDriveline. Dynamic models of the DCT were obtained including synchronizer, gear fork actuator system, and clutch Based on the dynamic models, a DCT shift performance simulator was developed. Test and simulation results were compared to verify the DCT shift performance simulator. It was found that the test and simulation results were good agreement, and it is expected that developed simulator can be used to improve the shift quality of the DCT.
후륜 독립현가방식 차량의 주차변속품질 향상에 대한 분석
배복수(Bok-soo Bae),이준영(Jun Young Lee),김문영(Moon Young Kim),임홍재(Hong Jae Yim) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.4
In this study, multi-body dynamic analysis was conducted to improve the shift feel that occurs while parking a car. A multi-body, dynamic simulation model of a vehicle was developed by using an independent rear suspension(IRS) and a rigid-axle suspension. To evaluate the shift feel, the displacement target of the upper-arm bushing was set with the help of a rigid-axle simulation model when the gear was disengaged. In the simulation, a shift shock with a displacement value that was above the limit was confirmed. Sensitive parts resulting in shift feel were derived from the simulation. To improve the shift feel of the IRS vehicle, the cause for such shift feel was investigated, and countermeasures were proposed. By applying the result of this analysis to a car, it would be possible to improve the shift feel. Therefore, the incompatibility between IRS and rigid-axle vehicles was resolved.