Abstract
This article describes the digital twin of power drive unit (engine and transmission) of 8-ton class wheel tractor with automatic gearbox. Detailed mathematical model of considered tractor power drive unit - engine with 16-speed automatic gearbox and friction shift of stages under load without breaking the power flow is given. The theoretical methods of research are based on the use of the MATLab package. With the help of fundamental package units, models of gearbox physical components are created: friction clutches, gears, shafts with the required properties, engine mathematical model, as well as model of the transmission control system. The calculation methods of the gearbox dynamic processes going on in the gear shifts using friction clutches is proposed. A feature of the mathematical model is consideration of the resistive torque, the rate of rise of switched on clutches friction torque, both during switching to the higher and lower gears. Mathematic simulation of tractor power drive unit operation under load was performed. The results of the completed calculations are presented. The possibility of using this digital model to simulate tractor operation during its main work operations is shown.
Highlights
This study describes a automatic gearbox (16 gears) proposed for an 8-ton class tractor
The kinematic scheme developed for the automatic gearbox (Fig. 1) includes friction clutches located on the input, intermediate shafts of the gearbox, simultaneously using a maximum of 4 friction clutches for shifting gears
Numerical simulation of a wheeled tractor as a system is a multidisciplinary task, covering such interacting subsystems as the internal combustion engine with a variable-speed governor, the automatic transmission with a control system using preset algorithms, the running gear interacting with soil and road, transport and traction loads on working bodies of agricultural machinery; mechanical, hydraulic, frictional, thermal processes occurring in the units and assemblies of the machine
Summary
This study describes a automatic gearbox (16 gears) proposed for an 8-ton class tractor. The proposed procedure is intended for calculating the dynamic characteristics of automatic transmission of tractors. The kinematic scheme developed for the automatic gearbox (Fig. 1) includes friction clutches located on the input, intermediate shafts of the gearbox, simultaneously using a maximum of 4 friction clutches for shifting gears. Examples of transmission designs of foreign and domestic industrial and agricultural tractors, the main modes of their operation are given in [6-8]. One of the most effective and rapid methods for simulating the operational characteristics of the tractor with a new automatic transmission is building a digital twin of the tractor.
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