Abstract
For the oil–electric–hydraulic hybrid power system, a logic threshold energy management strategy based on the optimal working curve is proposed, and the optimal working curve in each mode is determined. A genetic algorithm is used to determine the optimal parameters. For driving conditions, a real-time energy management strategy based on the lowest instantaneous energy cost is proposed. For braking conditions and subject to the European Commission for Europe (ECE) regulations, a braking force distribution strategy based on hydraulic pumps/motors and supplemented by motors is proposed. A global optimization energy management strategy is used to evaluate the strategy. Simulation results show that the strategy can achieve the expected control target and save about 32.14% compared with the fuel consumption cost of the original model 100 km 8 L. Under the New European Driving Cycle (NEDC) working conditions, the energy-saving effect of this strategy is close to that of the global optimization energy management strategy and has obvious cost advantages. The system design and control strategy are validated.
Highlights
With the rise and boom of the automobile industry, the number of automobiles has been increasing, but the related problem of environmental pollution has been growing
The oil–electric–hydraulic system requires one to install a hydraulic energy storage system on the rear axle of the existing oil-electric hybrid vehicle structure, which is proposed in this article and uses a timely four-wheel-drive structure with independent driving of the front and rear axles. Based on this structure, this study focuses on a steady-state energy management strategy in the driving and braking process, proposes a logic threshold energy management strategy based on the optimal working curve, and selects the relevant threshold according to the steady-state efficiency characteristic curve of the key components
A new type of oil–electric–hydraulic hybrid power system is examined as the research object, and a driving mode based on hydraulic energy and electric energy is selected
Summary
With the rise and boom of the automobile industry, the number of automobiles has been increasing, but the related problem of environmental pollution has been growing. Yin et al proposed a dual-planetary hybrid electric vehicle as an object of engine torque control This strategy can optimize the engine operating point while keeping the final battery state of charge (SOC) value within a reasonable range [4]. Compared with that of the traditional control strategy, the fuel economy based on the dynamic planning control strategy increased by about 20% [9] This strategy can achieve global optimization, it needs to obtain the entire driving conditions in advance, and the amount of calculation is large, which is difficult to apply to real vehicles. Accumulator, hydraulic hydraulic pump/motor, pump/motor, battery, battery, and continuously and continuously variable variable transmission
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