Optimization Method of Speed Ratio for Power-Shift Transmission of Agricultural Tractor

The speed ratio parameters of transmission are crucial factors that affect a vehicle’s power, economy, and comfort. Due to the complex working conditions, multiple modes, wide range ratios agricultural tractors, designing optimizing in power-shift transmissions is challenging task. This paper proposes optimization method based on life cycle utilization rate general-purpose tractors. optimized solved using genetic algorithm, with multi-gear tractors as research subject. results simulation analysis show has more denser gears common operating while ensuring tractors’ use requirements. Compared commonly used geometric series ratios, this can significantly improve fuel economy. Most importantly, provides practical reference for gearboxes structures.