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한기원(Kiwon Han),류완식(Wansik Ryu),장인규(In-Gyu Jang),전재욱(Jaewook Jeon),김현수(Hyunsoo Kim),황성호(Sungho Hwang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The continuously variable transmission (CVT), to implement speed ratio infinitely in the fixed range, has the characteristic of low fuel consumption and low exhaust gas due to operating the vehicle in a high efficiency range without concerning between engine speed and vehicle speed. The speed ratio of belt type CVT is controlled by adjusting line pressure. The line pressure control prevents slip between the pulley and the belt by conserving optimal line pressure, which is implemented by controlling the thrust force of actuators of both the drive-shaft and the driven-shaft. The one of the line pressure control methods, mechanical-hydraulic control is usually adopting VDT's control method, in which the secondary solenoid valve has two functions both a regulator and a line pressure controller. However, this control method could not show the high performance of CVT with optimal driving capability because of the limitation of simple control algorithm, and it could not gain market share sufficiently in spite of the advantage of CVT with low fuel consumption. On the other hand, the electro-hydraulic control method gives the enhancement of power performance and low fuel consumption by implementing various driving mode using the proportional control or PWM control. The key of CVT technique is to develop a control algorithm of the electro-hydraulic solenoid valve in order to implement the speed ratio efficiently. In this paper, the line pressure control algorithm is proposed and the speed control characteristic is validated using metal belt type CVT test rig and the embedded ECU platform.
임베디드 시스템을 이용한 AMT용 자동 클러치의 제어 성능 평가
한기원(Kiwon Han),류완식(Wansik Ryu),이상원(Sangwon Lee),전재욱(Jaewook Jeon),황성호(Sungho Hwang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
Drivers are becoming more fatigued and uncomfortable as traffic densities increase, this can lead to slower reaction time. They then face the danger of traffic accidents due to an inability to cope with frequent shifting. To reduce this risk some drivers prefer automatic transmissions to manual transmissions. However, the automatic transmission comes with both higher fuel consumptions and costs. For these reasons, the attention given to the automated manual transmission (AMT) is increasing, that has the advantages such as high efficiency, low cost and easy manufacturing. And the function and performance of an electronic control unit(ECU) for automobiles is improved continuously and rapidly with the growing electronics technology. The ECU is the representative embedded system of automobiles which has to satisfy high performance and reliability on the constrains of size and cost. In this paper, the embedded system platform for automobiles is developed on the basis of MPC565, and a test rig is developed to perform the bask function test for the automatic dutch actuation. The developed embedded system and dutch control algorithm are validated by the experimental results performed on the test rig.