Optimal selection method for full configuration of small power split transmission system

Abstract

The invention discloses a full configuration optimization and selection method of a small power split transmission system. The method includes: based on an optimization objective, multi-objective optimization is performed on a plurality of selected parameters of the configuration of different small power split transmission systems, and then Obtain the optimal target parameter combination under each configuration; classify the target parameters according to the design requirements, set the optimal type standard for each parameter class, and combine each of the optimal target parameter combinations under each configuration. The optimal target parameters are compared with the optimal standard in order, and all optimal target parameters satisfy the optimal standard are screened out. In the present invention, the multi-index optimization of the full transmission configuration is carried out first, and then the model selection between various schemes is carried out, thereby avoiding the problem that the appropriate configuration is neglected.

Description

technical field [0001] The present invention relates to the technical field of a selection method of a power shunt scheme. Background technique [0002] The common power split transmission system is composed of a continuously variable speed path, a mechanical path and a split and confluence mechanism. By reasonably distributing the transmitted power between the two transmission paths, the whole system can obtain relatively high transmission efficiency, and at the same time, it has a continuously variable speed change. capability and a wide range of speed ratio variations. [0003] The core technology of power splitting lies in matching. By designing and organically combining the parameters of the mechanism and components in the design selection, the power splitting transmission system can have different target characteristics, including wide speed ratio, high efficiency, high output torque, etc. . Regardless of whether the continuously variable transmission path is hydraul...

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Problems solved by technology

[0006] This method has the following defects: it only matches and optimizes the parameters, does not select the power splitting scheme, and may ignore the better transmission configuration that can achieve the goal; it only takes the optimal efficiency as the goal and does not consider the speed Ratio variation range and torque, not multi-objective optimization; it does not solve the contradiction between wide speed ratio and high torque; it selects the engine, motor, and battery under the condition that the mode switching condition of the control strategy is determined, and does not compare Optimal state of mode switching conditions for all control strategies, etc.

[0008] This method has the following defects: it only matches and optimizes the parameters, does not select the power splitting scheme, and may ignore the better transmission configuration that can achieve the goal; Obtain a larger output torque target; it is a parameter matching for the hybrid system, and the motor needs to be selected. If the motor has been determined in the actual design, it cannot be optimized

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