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[論文] 전자유압식 CVT의 운용 및 제어 소프트웨어 개발과 실시간 제어
권혁빈(H. B. Kwan),김광원(K. W. Kim),김현수(H. S. Kim),은탁(T. Eun),박찬일(C. L Park) 한국자동차공학회 1993 오토저널 Vol.15 No.3
In CVT vehicle, the engine speed is completely decoupled from the vehicle speed within the range from maximum transmission ratio to minimum transmission ratio. This allows the engine to operate in optimal state(e.g. best fuel economy or maximum power mode). In this study, the CVT control algorithm for optimal operation of engine is suggested. In order to implement the real time digital control of electro-hydraulic CVT system, a software called CVTCON has been developed. CVTCON also includes the CVT operation program. This operation and control software, CVTCON is composed of (1) CVT system operation module, (2) system test module, (3) system control module and (4) data management module. By using the CVTCON and the electro-hydraulic CVT system, two modes of experiments were carried out: constant throttle opening mode and acceleration mode. From the experimental results, it was found that the algorithm suggested in this study showed optimal operation of the CVT system.
김광원(K.W.Kim),권혁빈(H.B.Kwan),김현수(H.S.Kim),은탁(T.Eun),박찬일(C.I.Park) 한국자동차공학회 1992 오토저널 Vol.14 No.2
The response characteristics of a CVT vehicle is investigated numerically by using a Bondgraph model. Simulation results show the continuous behavior of the engine and the speed ratio for the CVT vehicle compared to the discrete behavior of the automatic transmission. Also, the optimal operation of the CVT vehicle is studied by using the Bondgraph model and a CVT map for a metal belt CVT which is derived from the speed ratio-torque-axial force equation from the previous works. It is found that the speed ratio of CVT has to be controlled corresponding to the optimal CVT ratio that makes the engine run on the optimal operating line.