Abstract
The multi-energy management strategy of electric drive system of tracked bulldozer was researched. Firstly, based on power requirement of typical working condition of a tracked bulldozer, the power distribution strategy for three energy sources in the front power chain was proposed by using wavelet theory and fuzzy control theory. Secondly, the electric drive system simulation platform was built in MATLAB/Simulink. At last, a driver-controller based HILS (hardware-in-the-loop simulation) platform was built and the multi-energy management strategy was verified. The HILS result shows that front power chain’s power output can meet the back power chain’s requirement, the engine-generator set works near the best fuel consumption curve, and the battery pack’s charge-discharge frequency and current are low. Thus the designed multi-energy management strategy can be used in real-time control of electric drive bulldozer.
Highlights
Nowadays, energy saving and environmental protection have become more and more important [1]
The power requirement signal was firstly processed by wavelet transform, high frequent part of the power requirement (Pcom HF) was distributed to the supercapacitor, and the capacitor’s operating mode is determined by its state of charge (SOCUC)
(1) If Pcom LF > 0, the bulldozer was in drive mode, and the outputs of the engine-generator set and the battery are determined by the distribution coefficient xfA, which is calculated by fuzzy controller A: Pgen = xfA ⋅ Pcom LF (1)
Summary
Energy saving and environmental protection have become more and more important [1]. The PHEV operated in different modes which were determined by control rules designed based on state of charge (SOC) of the battery, power requirement, vehicle speed, and engine coolant temperature. Dynamic models of the hybrid electric drive system was built and the global optimization control strategy was designed. The electric drive bulldozer contains 3 power sources: an engine-generator set, a battery pack, and a supercapacitor. The energy distribution strategy among these power sources determines the dynamic performance, fuel economy, and service life of critical components. The supercapacitor has an advantage of quickly responding to high frequent power requirement, so that the enginegenerator set would work steadily in the best fuel economy interval and the charge-discharge frequency and current are lower which are conductive to improve battery’s working life
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