Journal
ROBOTICS AND AUTONOMOUS SYSTEMS
Volume 171, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.robot.2023.104563
Keywords
Power -cycling variable transmission system; (PCVT); Wheel loader; Slope gradient; Mass; Identification; Shift
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A new power-cycling variable transmission (PCVT) is proposed and applied to construction vehicles to improve transmission efficiency. A shift correction strategy is developed based on identifying the changes in construction vehicles' mass and gradient. Simulation results show that the proposed method can correct shift points, improve operation efficiency, and ensure a safer operation process.
A new power-cycling variable transmission (PCVT) is proposed and applied to construction vehicles to improve transmission efficiency. To adapt to changes in external loads, construction vehicles need to shift gears continuously. However, the shift points obtained by traditional method cannot change with working conditions. This study aims to identify construction vehicles' mass and gradient changes, and to develop a shift correction strategy. The double-forgetting factors least squares method is designed to identify slope gradient and load. A PCVT dynamic shift strategy is developed based on speed ratio adjustment characteristics. Next, a modified shift strategy under different loading mass and slope gradient conditions is proposed based on the construction vehicles' mass change ratio, the gradient change ratio and balanced velocity. Simulation results show the proposed method can correct shift points, improve operation efficiency, avoid shift cycles and ensure a safer operation process.
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