Abstract

There are several different types of continuously variable transmission(CVT) such as toroidal drive, belt drive, hydrostatic drive, hydro-mechanical drive. The toroidal CVT is an alternative to the manual transmission, HST, power-shift gear trans-missions or other CVTs. The driver of the CVT tractor doesn't have to operate a shia lever since the CVT controller automatically controls the speed of tractor. Thus, it is much easier to operate the CVT tractor. The fuel efficiency of CVT tractor can be increased since the controller responds quickly to the change in external load on the wheel during field operation. This study was conducted to develop the hardwares and softwares for the toroidal CVT controller which control the variator and the range clutches. The hardware consisted of a measurement system, hydraulic system and computer. And the PID controller was developed using the simulation model of the CVT control system. Through the simulation, the control coefficients for the PID controller were selected. Finally, the performance of the CVT control system was evaluated by step response test and torque response test. The settling time of the CVT control system appeared to be fast enough for field operations.

주제어

#Tractor   #Transmission   #CVT   #Simulation   #PID   #Control System  

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참고문헌 (10)

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이 논문을 인용한 문헌 (1)

1. Yu, Ji-Hoon ; Choi, Young-Kyun ; Lee, Kyu-Cheol ; Kim, Young-Joo ; Ryu, Young-Sun ; Ryuh, Kwan-Hee 2009. "Development of 1-axis Exciter for a Seat Vibration Test of Agricultural Tractors(I) - Design of PID Controller for Position Control of 1-axis Exciter -" 바이오시스템공학 = Journal of biosystems engineering, 34(5): 305~314  원문보기 상세보기