Research On Energy Management And Recovery Strategy Of Series Hybrid Loader

With the rapid development of modern industry, the demand for oil is always raisingbut the stock is increasingly tense, and the deterioration of the environment is becoming thethreat to human health. Loader is a kind of common construction machinery which has highenergy consumption, so the study on the energy saving technology has important practicalsignificance and provides the theoretical and experimental foundation for further study ofother similar construction machinery. The traditional loader has problems like engine’s lowefficiency, transmission system’s energy consumption and braking energy’s waste. In viewof the above problems and taking into account the cost of renovation and practicalapplication, the paper proposes the series hybrid electric system using the fuzzy logiccontrol strategy for energy management and recovery, so the loader can work efficiently,stably and achieved good energy saving effect.The main research contents and conclusions including:1) Putting forward series hybrid loading system. The paper studied on the typicalworking condition’s characteristic of the loader, the causes of high energy consumption andlow efficiency of the traditional loader, and proposed the series hybrid loader systemscheme, which can make the engine run efficiently, improve the transmission efficiency andrecover the renewable energy in the process of braking.2) Putting forward series energy management control strategy of hybrid loader. Thepaper introduces the basic theory of fuzzy logic control algorithm and dynamicprogramming algorithm, which are applied in the series hybrid loading machine. The paperappraises the fuzzy logic control algorithm’s energy saving affect by using the optimalsolution of the dynamic programming algorithm. Experimental results show that, the use offuzzy logic control strategy can save13.28%fuel consumption comparing to conventionalloader and dynamic programming algorithm can save16.88%, so the fuzzy logic controlstrategy has high practical significance.3) Studding the algorithm of the braking energy recovery for loader. The modes of braking energy recovery are divided into series and parallel,. Using fuzzy logic algorithmcan solve the allocation problem of braking energy recovery ratio between mechanicalbraking and regenerative braking. The simulation results show that，the series hybrid systemscheme can save15.65%comparing to traditional loader by using the energy recoverycontrol algorithm.4) Building up the series hybrid loader bench and the simulation model ofMatlab/Simulink. Two groups of experiments and simulations were done: the traditionalloader bench test, the bench test and simulation of series hybrid loader using fuzzy logiccontrol strategy and the simulation of the series hybrid loader’s energy recovery strategy,whose model has been verified.Theoretical analysis and experimental results show that, the series hybrid electricloader’s scheme can make the engine work stably and efficiently. Energy management offuzzy logic control strategy has high practical value. Fuzzy logic control strategy cancalculate the distribution reasonablly between mechanical braking and regenerative braking,which can improve the system’s fuel economy.