Abstract
A power-split hybrid electric vehicle with a dual-planetary gearset is researched in this paper. Based on the lever analogy method of planetary gearsets, the power-split device is theoretically modeled, and the driveline simulation model is built by using vehicle modeling and simulation toolboxes in MATLAB. Six operation modes of the vehicle are discussed in detail, and the kinematic constraint behavior of power sources are analyzed. To verify the rationality of the modeling, a rule-based control strategy (RB) and an adaptive equivalent consumption minimization strategy (A-ECMS) are designed based on the finite state machine and MATLAB language respectively. In order to demonstrate the superiority of A-ECMS in fuel-saving and to explore the impact of different energy management strategies on emission, fuel economy and emission performance of the vehicle are simulated and analyzed under UDDS driving cycle. The simulation results of the two strategies are compared in the end, shows that the modeling is rational, and compared with RB strategy, A-ECMS ensures charge sustaining better, enables power sources to work in more efficient areas, and improves fuel economy by 8.65%, but significantly increases NOx emissions, which will be the focus of the next research work.
Highlights
In order to alleviate the dual pressure of oil shortage and environmental pollution, new energy vehicles have become the mainstream tendency of the development of the automobile industry
This paper focuses on two key technologies of power-split Hybrid electric vehicles (HEVs): the power-split device and energy management strategy
Variation of nitrogen oxides (NOx) emissions is significantly greater than that of HC and carbon monoxide (CO), because the engine speed and command torque will increase to ensure the operating points of the engine in a more efficient area when AECMS is adopted as shown in Figure 11(a), and according to Figure 12, the mass flow rate of NOx is much higher than HC and CO, and the production of NOx is more sensitive to the change of engine command torque than that of HC and CO
Summary
In order to alleviate the dual pressure of oil shortage and environmental pollution, new energy vehicles have become the mainstream tendency of the development of the automobile industry. The power-split device of 2010 Toyota Prius is designed with the double planetary gearset, the torque of the engine, motor and generator can be coupled without using clutches or brakes, and the vehicle can operate in multiple modes, so that the effect of oil saving is obvious. Based on equation (7), (14), and (17), the driveline simulation model shown in Figure 3 is built using Powertrain Blockset and Vehicle Dynamics Blockset in MATLAB-Simulink (the power-split device is highlighted in the dashed box). MG1 is driven to be positive rotation, since the torque of MG1 is all negative when operating, the output power is negative, which is used as a generator At this time, the electrical energy provided by MG1 for the battery is more than that consumed by MG2, so SOC increases slightly, and the battery is in charge on the whole.
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