Development of a Real-Time Tractor Model for Gear Shift Performance Verification

Abstract

Verification of the system is essential during the development of a tractor; however, there are cost and time limitations when verification is performed on an actual tractor. To solve this problem, we developed a tractor model for real-time simulation to verify the gear shift performance of the tractor and evaluate the control algorithm. This study examined and modeled a dual-clutch transmission (DCT)-type 105 kW class tractor. The proportional control valve, synchronizer, and clutch were modeled to accurately implement the shift behavior, and the developed individual model was verified based on actual individual product test data. The 45 s driving simulation was conducted to confirm whether real-time simulation of the entire developed tractor model was possible and whether it simulated the behavior of the target tractor well. The driving simulation results confirmed that the driving speed of the tractor model matched the engine speed, transmission gear ratio, and tractor specifications, and the gear shift performance of the tractor model according to the number of gears was confirmed. The simulated model thus satisfies the characteristics of the target tractor and can be used to verify the gear shift performance, indicating that the model can verify the performance of the control algorithm in real time.

Parameter Study for Establishing a Synchronizer Control Strategy in Tractor Dual-Clutch Transmission

“…However, it has a complex structure due to the combination of multiple clutches for gear shifts and lower power transmission efficiency compared to MT. To mitigate these disadvantages, dual-clutch transmission (DCT), offering continuous power without interruption and high power transmission efficiency similar to MT, has been developed and is increasingly adopted in tractors, particularly by leading foreign companies [6][7][8][9].…”