关键词: 混合动力系统；效率最优；功率分流；控制策略

Abstract: In order to improve the fuel economy of hybrid vehicles, an efficiency analysis method is proposed. By determining the relationship between engine fuel consumption and battery state of charge at different operating points of the vehicle, the battery power is converted into equivalent mileage. The goal is to calculate the optimal efficiency of the system at different operating points under different modes, with the maximum comprehensive mileage at each operating point as the objective, and optimize the optimal efficiency maps and corresponding torque distribution or power diversion maps for each mode, apply them to the actual vehicle control strategy, and reduce the calibration development cycle. Experiments have shown that the battery's state of charge remains balanced within a predetermined range, and the engine's operating points are distributed within an efficient area, which can effectively improve the real-time performance of hybrid control and the fuel economy of the entire vehicle, reducing system energy loss. This method can be calculated offline without relying on engineering experience, providing theoretical reference for vehicle calibration development, greatly reducing calibration development cycle and cost, and has good real-time performance when applied to vehicle strategy

Key words: hybrid powertrain; optimal efficiency; power shunts; control strategy