Abstract
To avoid unnecessary power loss during switching between the various power sources of a composite electric vehicle while achieving smooth operation, this study focuses on the development and dynamic simulation analysis of a control system for the power of a parallel composite vehicle. This system includes a power integration and distribution mechanism, which enables the two power sources of the internal combustion engine and electric motor to operate independently or in coordination to meet the different power-output requirements. The integration of the electric motor and battery-charging engine reduces the system complexity. To verify the working efficiency of the energy control strategy for the power system, the NEDC2000 cycle is used for the vehicle driving test, a fuzzy logic controller is established using Matlab/Simulink, and the speed and torque analysis of the components related to power system performance are conducted. Through a dynamic simulation, it is revealed that this fuzzy logic controller can adjust the two power sources (the motor and internal combustion engine) appropriately. The internal combustion engine can be maintained in the optimal operating region with low, medium, and high driving speeds.
Highlights
Vehicles with internal combustion engines produce greenhouse gases [1,2,3]
When the output power of the internal combustion engine exceeds the power required by the vehicle, the battery can be charged by driving the generator, which serves as an electric power source when the electric motor operates
The dynamic system model, hybrid power control module, and energy management control module are used to allow the internal combustion engine in the new parallel hybrid power system to operate in the optimal operating region under various driving conditions
Summary
Vehicles with internal combustion engines produce greenhouse gases [1,2,3]. pure electric vehicles have issues in terms of endurance, cost, charging time, and reliability of the lithium battery itself [4,5,6,7]. The electric motor works at low speed, while the internal combustion engine of a hybrid power vehicle is set to operate in the high-energy conversion efficiency area. According to the architecture of power control, hybrid electric vehicles can be divided into series and parallel configurations [11,12]. The parallel configuration has better efficiency than the series configuration, because in the former configuration, the internal combustion engine and electric motor can operate simultaneously, and greater power is synthesized through the power integration and distribution mechanism to drive the vehicle. When the output power of the internal combustion engine exceeds the power required by the vehicle, the battery can be charged by driving the generator, which serves as an electric power source when the electric motor operates. When the vehicle starts and runs at a low speed, the internal combustion engine does not move and is powered by the motor
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