Abstract
The structural concepts of Switch solenoid valve and proportional solenoid valve were proposed for the hydraulic shift control system of some hydrodynamic mechanical automatic transmissions. Shift oil pressure of stationary combination valve and proportional solenoid valve was modeled, simulated, contrasted and analyzed by dynamic simulation software in order to study the shift quality of heavy-duty vehicle automatic transmission. The results show that proportional solenoid valve is better to control the characteristic of shift oil pressure, reduce shift shock, improve shift quality and comfort than stationary combination valve. The correctness and validity of the model were verified through bench test, which reflected the dynamic characteristics of shift oil pressure of hydrodynamic mechanical automatic transmission. The results can be used to match the performance and predict heavy-duty vehicle shifting process, and to further lay the foundation for the enhancement of shift performance of the system.
Highlights
Requirements for heavy-duty vehicle hydrodynamic mechanical automatic transmission (AT) on the shift quality, are smooth shifting process, small shifting shock and reduced dynamic load in the process of shifting [1,2,3,4]
Fig. (1) shows the transmission system of one hydrodynamic mechanical automatic transmission, which consists of four planetary gears train including GF, ZD, DD, and FD
One shifting is controlled by switch electromagnetic valve; the other one suggests that shifting is controlled by proportional solenoid valve
Summary
Requirements for heavy-duty vehicle hydrodynamic mechanical automatic transmission (AT) on the shift quality, are smooth shifting process, small shifting shock and reduced dynamic load in the process of shifting [1,2,3,4]. Stationary combination valve on heavy-duty vehicle hydrodynamic mechanical automatic transmission is used to control cylinder oil filled pressure during the combination of clutch or brake, which controls hydraulic characteristic by structure parameters., and It is a simple method, with high reliability and low cost. The advantage of proportional solenoid valve is that it can flexibly control oil pressure of combination elements during shifting process by adjusting current duty ratio, so that the process of shifting becomes stable. Domestic research is still in its infancy, and most of the researches just study clutch cylinder oil-filled pressure in the process of shifting based on the structure of the hydraulic control system. Kinematic and dynamic characteristics of AG4 transmission were qualitatively analyzed in the process
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