Design and performance of a distributed electric drive system for a series hybrid electric combine harvester

Abstract

In order to solve the problems of high energy consumption, high pollution and difficult adjustment of operational parameters caused by the coupling of operating components of conventional combine harvester, a novel series hybrid electric combine harvester (SHECH) is proposed. This paper is based on series hybrid power technology and distributed electric drive technology. The balance between SHECH energy consumption and endurance is coordinated by a range-extender and power battery with components decoupled by independent multi-motor driving. The mathematical models of SHECH operating components are established and the power system parameters are designed according to the operational requirements. Furthermore, the dynamic performance, performance of components and fuel economy of SHECH are analysed. Simulation results indicate that SHECH can recover 7.50% of battery state of charge during a single unloading operation, and the maximum operating area in pure electric mode is approximately 10,000 m2. This not only ensures operational performance but also effectively reduces fuel consumption. A hardware in the loop test was carried out to verify the power performance and the function of energy management system of SHECH. In addition, SHECH greatly simplifies the drive system and improves power transmission efficiency compared to conventional combine harvesters. Moreover, the function of independent operation of each component provides the basis for realising the speed adjustment of each key component as required. It provides a new idea for the research of improving harvester operation performance, and further expand space for strengthening the intelligence and adaptability of combine harvesters.