A control method for a dual-motor multi-speed coupling drive system

Abstract

The invention relates to a control method of a dual-motor multi-gear coupling drive system. The method is based on the traditional energy consumption economy, taking into account the problem of shift frequency and the smoothness of instantaneous torque. Through the shift time counter C and the shift penalty factor Ω to constrain and optimize the shift frequency during the operation of the power system, by setting the dual-motor torque fluctuation penalty function P To constrain and optimize the smoothness of torque transformation during the operation of the power system, the current optimal control law can be solved in real time online, and then the working points of the two motors and the gear of the transmission device can be planned; in each optimization process, the energy consumption And smoothness and other indicators are coupled in a unified objective function to solve, and through the designed weight or penalty factor function to coordinate each objective, that is, the multi-objective optimization problem can be transformed into a single-objective optimal control problem, thus ensuring its Can be solved online.

Description

technical field [0001] The invention relates to the control of a power coupling device of a pure electric vehicle, and more particularly relates to a control method of a dual-motor multi-speed coupling drive system. Background technique [0002] In order to cope with the deteriorating environmental pollution and energy crisis, it is of great significance to develop and promote pure electric vehicles, and our country has listed them as strategic emerging industries. At present, pure electric vehicles have been widely used in commercial vehicles such as public transportation, and have shown huge advantages in energy saving and environmental protection. The electric drive system based on motor is the core component of electric commercial vehicles. Compared with traditional vehicles driven by internal combustion engines, its external characteristics of low-speed constant torque and high-speed constant power show great advantages. [0003] The centralized electric drive configur...

AI Technical Summary

Problems solved by technology

[0006] Based on the multi-objective optimization control system, it can make better use of the inherent excellent characteristics of electric drive, and the vehicle runs more efficiently and smoothly. However, during multi-objective optimization, the variables are coupled with each other. The previous control theory for a single dynamic object is difficult to meet the optimization requirements. The strategy needs to be redesigned, and the objective function should be reasonably selected to take into account multiple vehicle performance optimization control effects and the practicability of the algorithm

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