Study on Control Strategy of Tandem Hybrid Tractor Considering Battery Life Decay

PurposeTo extend the battery life and improve the engine fuel economy of a hybrid tractor.

MethodsOptimized the traditional power-following control strategy based on a comprehensive consideration of the battery charge state, battery temperature and the highest and lowest voltage difference of a single battery on battery life; established a battery life decay model to quantify the amount of capacity decay, performing transport condition simulation in the ADVIOSR simulation system, and conducted a dSPACE-based rapid prototype simulation test rig on the plowing condition test.

ResultsCompared with the traditional power-following strategy, the fuel economy of the improved control strategy could be improved by 2.4%, and the battery capacity decay mitigation rate reached 14%-25%.

ConclusionThe improved control strategy has better fuel economy on the basis of satisfying the tractor power performance, and the battery life is effectively improved while reducing the fuel consumption. This study can provide reference for the subsequent complex energy management control strategy.