Abstract:Traditional hydraulic or pure electric driven tracked agricultural machinery equipment has problems such as highpower consumption, response lag, short battery life, and insufficient power and torque output. A type of high-efficiency electro-hydraulic track chassis was proposed, which integrated two independent power systems of hydraulic drive and electric drive, four-wheel drive structure with two hydraulic motors and two servo motors. It can realize the use of small power engine to output large torque, which was conducive to the lightweight design. At the same time, the speed and torque closed-loop control of the servo motor can adapt to the changes of the external load of the matching chassis, which can significantly improve the dynamic output characteristics of the closed hydraulic drive system, improve the dynamic control performance of the whole machine and reduce the energy consumption. A co-simulation model of the electro-hydraulic system was established based on AMESim and Matlab. The simulation compared and analyzed the driving performance of the whole machine under different working conditions, such as straight driving on flat ground, mountain climbing and in-situ steering. The prototype test results showed that the maximum speed of the electro-hydraulic drive track chassis was 1.1m/s, the fastest turning time was 2.4s, and the minimum turning diameter was 150cm, which can realize turning and turning around on the complex terrain of hills and mountains. The offset of track chassis in a straight line was less than or equal to 3.3%. Compared with the hydraulic drive under the same working conditions, the electro-hydraulic mode can reduce the energy consumption of at least 9.3%, effectively reduce the energy consumption and improve the working efficiency of the whole machine.
