| Powertrain matching is one of the six key technologies of hybrid vehicles.A reasonable hybrid powertrain system can better play the superiority of hybrid vehicles.The simplest hybrid powertrain system is based on the transmission system of traditional automatic transmissions.The electro-hydraulic control module is one of the core components of the automatic transmission.The structural principle and control logic directly affect the response performance of the automatic transmission.Based on the parameters of a certain type of hybrid automatic transmission,this paper has carried out forward design of its electro-hydraulic control module,and carried on the simulation analysis to the designed electro-hydraulic control system,and the control module is tested based on the sample.The main contents of this paper are as follows:(1)Analyzed the input principle and output requirements of the electro-hydraulic control module of the hybrid automatic transmission.Based on this analysis,the hydraulic schematic diagram of the electro-hydraulic control system was designed and detailed structural design of the main hydraulic components was carried out.Completed electro-hydraulic module assembly model based on UG modeling software.(2)Based on the ANSYS workbench simulation platform,the strength analysis and structural optimization of the valve plate were completed.A multi-physics coupling analysis was performed on the valve core part,and the influence of thermal deformation,particulate contamination and valve core bias on the valve core friction and the stuck condition of the valve core were analyzed.Through the dynamic simulation of the valve core,it is concluded that the spring preload and the control pressure have a certain compensating effect on the delayed response caused by the additional friction force of the valve core.(3)A simulation analysis was performed on the hydraulic system based on the LMS Imagine.Lab AMESim system dynamics simulation software,and the pressure response characteristics of the main hydraulic components were obtained.The flow matching design of the cooling oil circuit was analyzed,and the control characteristics of the overall hydraulic system were obtained through the control of the oil pump and the proportional solenoid valve.(4)The comprehensive test and anti-pollution endurance test of the electro-hydraulic control module system of the automatic transmission were designed for the sample,and analyzed the operating characteristics under different environmental conditions.This paper completed the forward design and optimization process of the initial sample of the electro-hydraulic control module,and made a comparatively in-depth analysis on the valve core friction and stuck conditions,which provided theoretical and practical basis for autonomous research of hybrid automatic transmission in China. |
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