Simulation and experimental research of electric tractor drive system based on Modelica

Abstract

The electric tractor has the advantages of zero-emission, high efficiency, and low noise, which is the direction of future development and transformation of agricultural power machinery. Aim at the problem that the simulation methods commonly used in the development of electric tractor drive system are poorly generalized and cannot meet the simulation needs of complex multi-domain physical systems. This paper proposes a modeling method for an electric tractor drive system, takes the YTO-500 tractor as the research object, designs and calculates the overall scheme and parameters of its drive system, divides the drive system into modules, establishes the energy system, motor system and mechanical parts model based on Modelica, and integrates the simulation model of electric tractor drive system on this basis. The traction performance and transportation working conditions were simulated and tested. With compared and analyzed, in the traction characteristics, the simulation and test results of maximum speed, maximum traction force, and maximum traction power of each gear are consistent; within 400s transportation simulation conditions, the speed range of electric tractor is 13~28km·h-1, which is consistent with the speed range of electric tractor transportation gear. The results show that the simulation and the test results are consistent, which verifies the credibility of the simulation and the correctness of the model built, providing a basis for future research and development of agricultural machinery.

Electric Vehicle Power System in Intelligent Manufacturing Based on Soft Computing Optimization

“…Mao et al developed models of the energy system, motor system, and mechanical parts using Modelica and suggested a modeling approach for the drive system of an electric tractor. The findings supported the validity of the simulation and the accuracy of the model, laying the groundwork for upcoming agricultural machinery research and development (Mao et al 2022).…”

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

“…The cross-sectional area to which the pressure of the 3-stage proportional control valve was applied was area 1 regardless of the sleeve position. Equation (2) shows the sleeve force calculated when the sleeve position is negative. When the 1-stage engagement signal current was applied, the 1-stage PCV supplied pressure, and the 3-stage PCV did not.…”

“…Cheng et al [1] developed a fulltractor simulation model, including the control system, using MATLAB and Carsim to improve the performance of the electronic stability program system among the tractor control systems. Mao et al [2] used Modelica to build a drive system model for an electric tractor and predicted its performance. Yiwei et al [3] built a power-shift transmission (PST) model, including mechanical, hydraulic, and control systems, using Adams, AMEsim, and MATLAB to develop a new type of tractor.…”

Optimizing and Integrating Electromechanical Actuators in Agricultural Excavator Booms for Enhanced Efficiency and Battery Longevity

“…The electromechanical actuator (Fig. 4) consists of the following components: a 12 V / 250 W / 3000 rpm permanent magnet DC motor (PMDC Motor) (1), a PCM040U worm gear reducer (2) with a transmission ratio i = 60, a BSH 12 x 04 ball nut (3), an E40S6-50-3-T-24 rotary encoder (4), a 2GT-6 mm toothed belt transmission (5), and a C7 12 x 04 ball screw (6). The operation involves the electric motor transmitting rotational motion to the ball screw, subsequently converted into translational motion by the ball nut, connected to the actuator drive rod (8).…”

“…The price of tractors in agricultural operations is influenced by the trend of electrification and automation of agricultural machinery. The electric agricultural tractor has seen an exponential increase in interest among farmers, manufacturers and researchers in the agricultural industry (Mao et al, 2022;Scolaro et al, 2021;Troncon and Alberti, 2020;Mocera et al, 2023;Dhond et al, 2021), with electric vehicle (EV) sales reaching record highs. The presence of electric tractors on modern agricultural farms is also influenced by farmers' desire to use renewable sources to power them.…”