Shifting control strategy of a tractor AMT system

ABSTRACT

To improve the efficiency of agricultural production, it is necessary to use Automated Mechanical Transmission(AMT) system to tractors. The required functions of the AMT system are analysed though some YTO-LX series tractors. Taking the difference between real and target speeds and the change percentage of difference as control parameters, the engine’s control strategy is determined based on fuzzy control theory. The control strategy of clutch engaging during gear shifting is made with tractor driving dynamics. The integrated control strategy of shifting is developed though closed-loop control. The simulation model of the tractor is developed by Cruise software, and the power and fuel economy of tractors is determined. The correctness and feasibility of the control strategy and system parameters are verified. Simulation results show that the tractor AMT system is controlled effectively, and several working modes are achieved. When the tractor ploughs in the low IV gear to middle IV gear, the maximum traction is 43.62 kN, the top speed is 13.65 km/h, the max shift time is 0.95 s, the max shifting shock extent is 14.75 m/s³ and the fuel consumption is about 25 kg/h.

KEYWORDS:

• Tractor
• Automated Mechanical Transmission
• fuzzy control strategy

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Key Research and Development Program of China during the 13th Five-Year Plan Period [No. 2016YFD0701002, [2017YFD070020-402], Henan University of Science and Technology Innovation Talents Support Program [18HASTIT026] and Henan province production and research cooperation project [182107000010].