Research On Energy Management Strategy For Solar Refrigerated Transport Vehicles

In recent years,with the improvement of our country’s living standards,people have higher and higher requirements for food freshness.The demand for cold chain logistics transportation is increasing in order to meet people’s needs.However,refrigerated trucks mainly apply the engine as a power source for the refrigeration unit,which requires the idle speed to drive the refrigerator.As a result,the refrigerated truck’s fuel consumption will increase.When the refrigerated truck stops,the refrigerating power source is cut off,and the refrigerated transport compartment cannot be guaranteed.This dissertation proposes a solar energy-based dual-compressor solar energy storage hybrid refrigeration system aiming at solving these problems mentioned above.The main work and contents of the full text are summarized as follows:(1)It elaborates the current research situation of solar refrigerated transport vehicles.It classifies the existing energy management strategies as well,which attempts to provide reference for energy management of solar refrigerated transport vehicles.(2)This thesis introduces the working principle of dual-compressor solar refrigerated transport vehicle based on photovoltaic energy storage hybrid refrigeration system.It establishes the mathematical model of solar refrigerated transport vehicle,and sets up a corresponding simulation model in Matlab/Simulink.(3)According to the working characteristics and working requirements of solar-powered refrigerators,it must ensure the principle of reducing the fuel consumption of refrigerated trucks,under the conditions of setting the temperature in the compartments of the refrigerated compartments.A rule-based control strategy is selected.The mechanism is based on the different operating states of the refrigerated truck,the engine operating speed,the engine torque,and the battery SOC.The critical operating point is set to switch the dual compressor refrigeration system.It inputs the control strategy in Matlab/Simulink and carries on the simulation under the NEDC working condition and CTBDS-UD working condition in order to obtain the current vehicle speed value,the figures of engine speed,fuel consumption and the curves of battery’s SOC change.All of these verify the fuel economy and feasibility of refrigerated trucks’ fuel assumption.(4)According to the working characteristics of the electric compressor of the solar refrigerated transport vehicle,it designs the fuzzy controller of the electric compressor.The temperature differences between the electric compressor’s setting temperature and the temperature in the refrigerated transport compartment is viewed as fuzzy controller’s input parameters.The output parameter is the electric compressor’s output speed.It uses a fuzzy control method to control the speed of the electric compressor in order to obtain the speed curve torque curve 、current and voltage curve of the electric compressor.(5)Relying on Zhenjiang Fei Chi Automobile Group,it builds a solar refrigerated transport vehicle.It carries out vehicle compartment temperature cooling experiments and vehicle fuel consumption experiments after the building of solar refrigerated transport vehicle in order to verify the theoretical results of the simulation.The experimental results show that the simulation and experimental results are consistent.At the same time,it carried on a solar charging experiment.Conclusion can be reached that the solar refrigerated transport vehicle can charge 4.45 kW·h of electricity achieving considerable results.