Full-configuration optimization type selection method for small power split transmission system

Abstract

The invention discloses a small power split transmission system full-configuration optimization type selection method, which comprises the steps of performing multi-target optimization on a plurality of selected parameters of different configurations of a small power split transmission system based on an optimization target, and further obtaining an optimal target parameter combination under each configuration; and classifying the target parameters according to design requirements, setting an optimal selection type standard of each parameter class, comparing each optimal target parameter in the optimal target parameter combination under each configuration with the optimal selection type standard in sequence, and screening out a scheme in which all optimal target parameters meet the optimal selection type standard. According to the method, the multi-index optimization of the full-transmission configuration is firstly carried out, and then the model selection among the schemes is carried out, so that the problem that a proper configuration is ignored is avoided.

Description

technical field [0001] The invention relates to the technical field of a type selection method for a power split scheme. Background technique [0002] A common power split transmission system consists of a continuously variable transmission path, a mechanical path, and a split and confluence mechanism. By reasonably distributing the transmitted power between the two transmission paths, the entire system can obtain a relatively high transmission efficiency, and at the same time has a continuously variable transmission. ability and a wide range of speed ratio changes. [0003] The core technology of power splitting lies in matching. In the design and selection, through the design and organic combination of the parameters of the mechanism and components, 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 h...

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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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