The energy management strategy is the key factor for hybrid vehicles since it determines how efficiently the engine power is transferred to the wheels. As a local-optimal and implementable strategy, the equivalent consumption minimization strategy is of great research interest. The equivalent factor and the gain coefficient of penalty function are two important parameters in the strategy that need to be determined in advance. It is challenging to choose these parameters to achieve minimum fuel consumption in different on-road driving cycles. For some off-road vehicles, such as wheel loaders, the loading cycle is highly repetitive. This brings a great opportunity to optimize these parameters cycle-to-cycle. In this study, an adaptive equivalent consumption minimization strategy is applied to a series hydraulic hybrid wheel loader. A cycle-to-cycle tuning scheme is developed where the equivalent factor and the gain coefficient of penalty function are optimized through repetitive loading cycles. The potential with parameter optimization in different loading cycles is identified. Results show a fuel-saving with the cycle-to-cycle optimization method of up to 6.36% in a 57 s loading cycle.
Bibliographical noteFunding Information:
This work was supported in part by the National Natural Science Foundation of China under Grant 51875509, in part by the NSFC-Shanxi Joint Fund underGrant U1910212, and in part by the Zhejiang Provincial Natural Science Foundation under Grant LR22E050003.
© 1967-2012 IEEE.
- Equivalent consumption minimization strategy
- cycle-to-cycle optimization
- equivalent factor
- hydraulic hybrid wheel loader
- penalty function