Instantaneous Minimum Fuel Consumption Control for Parallel Hybrid Hydraulic Excavator

Xu Miao*, 1, Zhao Dingxuan1, Ni Tao1, Wang Yao1, 2
1 College of Mechanical Science and Engineering, Jilin University, Changchun, Jilin, 130022, P.R. China
2 College of Mechanical Engineering, Beihua University, Jilin, Jilin, 132021, P.R. China

© 2015 Miao et al

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Hybrid excavator control strategy based on rules optimizes the specific fuel consumption only to determine engine operating point in the perspective of qualitative analysis, it is not sufficient to reduce the excavator fuel consumption because of ignoring the affect of engine power output. In this paper, an instantaneous minimum fuel consumption control strategy for hybrid power-train is proposed, strategy determines the ideal operating point taking both the main influence factors of fuel consumption into consideration, the ultra-capacitor energy variation which is caused by the motor power output is converted to the equivalent fuel consumption and included in the current power-train fuel consumption. The output torque combination of the engine and motor which minimize the current fuel consumption is adopted. The bench test results validate that the engine is 12% fuel saving on average after optimizing, and at the same time the ultra-capacitor energy is effectively maintained.

Keywords: Hydraulic excavator , hybrid , minimum fuel consumption, optimization.